Comments (17)
ghuls
commented on August 19, 2024
2
In the mean time I switched from TruePNG to pngquant + zopflipng for the specific type of images I had (final filesize was very close to TruePNG + zopflipng.
It seems like TruePNG is deprecated and replaced by https://css-ig.net/pingo (seems to have benchmarks with oxipng, which seem to give very similar results).
The following seems to generate much better images than in the past:
❯ oxipng -v -v --strip=all -o max -Z --out /tmp/test.png test.png
Processing: test.png
399x199 pixels, PNG format
8-bit RGB, non-interlaced
IDAT size = 15547 bytes
File size = 18044 bytes
Eval: 8-bit Indexed (162 colors) None 8283 bytes
Eval: 8-bit RGB None >8283 bytes
Eval: 8-bit Indexed (162 colors) Bigrams >8292 bytes
Eval: 8-bit RGB Bigrams >8292 bytes
Reducing image to 8-bit Indexed (162 colors), non-interlaced
Trying: 10 filters
zc = 0 f = Sub 7936 bytes
zc = 0 f = Average >11763 bytes
zc = 0 f = None 6510 bytes
zc = 0 f = MinSum >8756 bytes
zc = 0 f = Brute >7439 bytes
zc = 0 f = Paeth >8956 bytes
zc = 0 f = Up >9153 bytes
zc = 0 f = Bigrams >7482 bytes
zc = 0 f = BigEnt >8467 bytes
zc = 0 f = Entropy >8438 bytes
Found better combination:
zc = 0 f = None 6510 bytes
IDAT size = 6510 bytes (9037 bytes decrease)
file size = 7065 bytes (10979 bytes = 60.85% decrease)
Output: /tmp/test.png
# Original image ==> reduced with pngquant ==> pngquant image recompressed with zopflipng CLI tool.
-rw-r--r-- 1 ghuls domain users 18044 Dez 1 2021 test.original.png
-rw-r--r-- 1 ghuls domain users 7761 Dez 1 2021 test.pngquant.png
-rw-r--r-- 1 ghuls domain users 6963 Dez 1 2021 test.pngquant_with_zopflipng.png
# Original image ==> reduced with oxipng (with -Z option) ==> oxipng image recompressed with zopflipng CLI tool.
-rw-r--r-- 1 ghuls domain users 18044 Dez 1 2021 test.original.png
-rw-r--r-- 1 ghuls domain users 7065 Mai 8 16:32 /tmp/test.oxipng.png
-rw-r--r-- 1 ghuls domain users 6972 Mai 8 18:44 /tmp/test_oxipng.zopflipng.png-Z zopfli option does not work as good as the external zopflipng CLI tool for reducing the size.
from oxipng.
ghuls
commented on August 19, 2024
2
@TPS Yes they are. They are very simple PNG images made with weblogo: https://weblogo.threeplusone.com/examples.html#splice
Maybe you didn't see it well, oxipng (oxipng -v -v --strip=all -o max -Z --out /tmp/test.png test.png) generates a smaller image than pngquant, but the image can be made smaller for both when running zopflipng on both. In the latter, the pngquant image is slightly smaller (although the -Z option should already have done a zopflipng like pass).
When comparing the pngquant and oxipng PNG files, both have 162 colors pallet and the colors are exactly the same according to imagemagick compare:
$ identify test.pngquant.png
test.pngquant.png PNG 399x199 399x199+0+0 8-bit sRGB 162c 7761B 0.000u 0:00.000
$ identify /tmp/test.oxipng.png
/tmp/test.oxipng.png PNG 399x199 399x199+0+0 8-bit sRGB 162c 7065B 0.000u 0:00.000
$ compare -metric PSNR test.pngquant.png /tmp/test.oxipng.png /tmp/diff.png
inffrom oxipng.
shssoichiro
commented on August 19, 2024
1
It looks like compressor.io uses pngquant behind the scenes, which uses quantization to reduce the number of colors needed to store a PNG image. It looks like this is represented in #76, but I must have checked off the wrong item in the list on this issue, because it's not implemented in oxipng yet.
from oxipng.
ghuls
commented on August 19, 2024
1
When I tested it, yesterday, I build the latest git version 2f622fc7bd610c3e8a0d2471c5d46c63f32cd626
from oxipng.
ghuls
commented on August 19, 2024
1
I use the original zopfli.
At first I had problems generating the same small file with pngquant + zopflipng (smallest I got was only 6972) as the one I made 2 years ago. Then I remembered that I enabled extra rounds of compresssion: zopflipng -m (6963 bytes).
When running oxipng -v -v --strip=all -o max -Z --out test.oxipng.png test.png and zopflipng -m test.oxipng.png test.oxipng.zopflipng.png, I now also get a PNG file of 6963 bytes (and the palette is in the same order as with pngquant + zopflipng ).
File: test.original.png (18044 bytes)
OK: test.original.png (399x199, 24-bit RGB, non-interlaced, 92.4%).
File: test.pngquant.png (7761 bytes)
PLTE chunk: 162 palette entries
0: (255,165, 0) = (0xff,0xa5,0x00)
1: ( 67,161, 67) = (0x43,0xa1,0x43)
2: (187,221,187) = (0xbb,0xdd,0xbb)
3: (255,206,118) = (0xff,0xce,0x76)
4: ( 0, 0, 0) = (0x00,0x00,0x00)
5: (118,187,118) = (0x76,0xbb,0x76)
6: (255,231,187) = (0xff,0xe7,0xbb)
7: (255,255,255) = (0xff,0xff,0xff)
8: ( 0,128, 0) = (0x00,0x80,0x00)
9: (118,118,118) = (0x76,0x76,0x76)
10: (153,153,153) = (0x99,0x99,0x99)
11: (255,188, 67) = (0xff,0xbc,0x43)
12: (200,200,200) = (0xc8,0xc8,0xc8)
13: (187,187,187) = (0xbb,0xbb,0xbb)
14: (227,227,227) = (0xe3,0xe3,0xe3)
15: (180,180,180) = (0xb4,0xb4,0xb4)
16: ( 67, 67, 67) = (0x43,0x43,0x43)
17: (255,249,238) = (0xff,0xf9,0xee)
18: (255,170, 16) = (0xff,0xaa,0x10)
19: (118,118,255) = (0x76,0x76,0xff)
20: (255,219,153) = (0xff,0xdb,0x99)
21: (187,187,255) = (0xbb,0xbb,0xff)
22: ( 50,153, 50) = (0x32,0x99,0x32)
23: ( 16,136, 16) = (0x10,0x88,0x10)
24: (221,221,221) = (0xdd,0xdd,0xdd)
25: (238,246,238) = (0xee,0xf6,0xee)
26: (255,200,101) = (0xff,0xc8,0x65)
27: (255,237,204) = (0xff,0xed,0xcc)
28: (204,229,204) = (0xcc,0xe5,0xcc)
29: (255,194, 84) = (0xff,0xc2,0x54)
30: (255,243,221) = (0xff,0xf3,0xdd)
31: (180,156,112) = (0xb4,0x9c,0x70)
32: ( 33,144, 33) = (0x21,0x90,0x21)
33: (255,176, 33) = (0xff,0xb0,0x21)
34: (227,161, 40) = (0xe3,0xa1,0x28)
35: (255,182, 50) = (0xff,0xb6,0x32)
36: ( 16, 16, 16) = (0x10,0x10,0x10)
37: (101,178,101) = (0x65,0xb2,0x65)
38: ( 67, 67,255) = (0x43,0x43,0xff)
39: (153,204,153) = (0x99,0xcc,0x99)
40: (255,213,136) = (0xff,0xd5,0x88)
41: (170,212,170) = (0xaa,0xd4,0xaa)
42: (136,195,136) = (0x88,0xc3,0x88)
43: ( 84,170, 84) = (0x54,0xaa,0x54)
44: (255,225,170) = (0xff,0xe1,0xaa)
45: (238,238,238) = (0xee,0xee,0xee)
46: (255,187,187) = (0xff,0xbb,0xbb)
47: ( 33, 33, 33) = (0x21,0x21,0x21)
48: ( 50, 50, 50) = (0x32,0x32,0x32)
49: (204,204,204) = (0xcc,0xcc,0xcc)
50: (101,101,101) = (0x65,0x65,0x65)
51: (221,238,221) = (0xdd,0xee,0xdd)
52: ( 0, 0,255) = (0x00,0x00,0xff)
53: (170,170,170) = (0xaa,0xaa,0xaa)
54: ( 40,134, 40) = (0x28,0x86,0x28)
55: (136,136,136) = (0x88,0x88,0x88)
56: ( 81,141, 81) = (0x51,0x8d,0x51)
57: (112,146,112) = (0x70,0x92,0x70)
58: (255,118,118) = (0xff,0x76,0x76)
59: (255, 0, 0) = (0xff,0x00,0x00)
60: (204,204,255) = (0xcc,0xcc,0xff)
61: (136,136,255) = (0x88,0x88,0xff)
62: (238,238,255) = (0xee,0xee,0xff)
63: (101,101,255) = (0x65,0x65,0xff)
64: (241,241,241) = (0xf1,0xf1,0xf1)
65: (214,214,214) = (0xd6,0xd6,0xd6)
66: (153,153,255) = (0x99,0x99,0xff)
67: (234,234,234) = (0xea,0xea,0xea)
68: (170,170,255) = (0xaa,0xaa,0xff)
69: ( 84, 84,255) = (0x54,0x54,0xff)
70: (112,112,112) = (0x70,0x70,0x70)
71: (221,221,255) = (0xdd,0xdd,0xff)
72: ( 84, 84, 84) = (0x54,0x54,0x54)
73: (200,158, 81) = (0xc8,0x9e,0x51)
74: (248,248,248) = (0xf8,0xf8,0xf8)
75: ( 50, 50,255) = (0x32,0x32,0xff)
76: (102,102,102) = (0x66,0x66,0x66)
77: ( 33, 33,255) = (0x21,0x21,0xff)
78: ( 54, 54, 54) = (0x36,0x36,0x36)
79: (255, 67, 67) = (0xff,0x43,0x43)
80: ( 16, 16,255) = (0x10,0x10,0xff)
81: (248,164, 10) = (0xf8,0xa4,0x0a)
82: (234,162, 30) = (0xea,0xa2,0x1e)
83: (166,166,166) = (0xa6,0xa6,0xa6)
84: ( 86, 86, 86) = (0x56,0x56,0x56)
85: ( 25, 25, 25) = (0x19,0x19,0x19)
86: (173,173,173) = (0xad,0xad,0xad)
87: (214,160, 60) = (0xd6,0xa0,0x3c)
88: (241,163, 20) = (0xf1,0xa3,0x14)
89: ( 31, 31, 31) = (0x1f,0x1f,0x1f)
90: (154,130,187) = (0x9a,0x82,0xbb)
91: (207,207,207) = (0xcf,0xcf,0xcf)
92: (255,221,221) = (0xff,0xdd,0xdd)
93: (116,162, 49) = (0x74,0xa2,0x31)
94: (177,202,177) = (0xb1,0xca,0xb1)
95: (137,137,137) = (0x89,0x89,0x89)
96: (191,175, 54) = (0xbf,0xaf,0x36)
97: ( 60,137, 60) = (0x3c,0x89,0x3c)
98: (234,195,124) = (0xea,0xc3,0x7c)
99: ( 40, 40, 40) = (0x28,0x28,0x28)
100: (255,101,101) = (0xff,0x65,0x65)
101: ( 17, 17, 17) = (0x11,0x11,0x11)
102: (209,202,124) = (0xd1,0xca,0x7c)
103: ( 89,158, 89) = (0x59,0x9e,0x59)
104: (139,159,139) = (0x8b,0x9f,0x8b)
105: ( 39, 39, 39) = (0x27,0x27,0x27)
106: (192,196,192) = (0xc0,0xc4,0xc0)
107: ( 92, 92, 92) = (0x5c,0x5c,0x5c)
108: (200,174,128) = (0xc8,0xae,0x80)
109: (248,220,168) = (0xf8,0xdc,0xa8)
110: (159,159,159) = (0x9f,0x9f,0x9f)
111: (193,193,193) = (0xc1,0xc1,0xc1)
112: (234,171, 56) = (0xea,0xab,0x38)
113: (180,172,157) = (0xb4,0xac,0x9d)
114: (180,167,143) = (0xb4,0xa7,0x8f)
115: (180,160,125) = (0xb4,0xa0,0x7d)
116: (180,173,162) = (0xb4,0xad,0xa2)
117: (175,177,175) = (0xaf,0xb1,0xaf)
118: (248,202,120) = (0xf8,0xca,0x78)
119: (227,183,102) = (0xe3,0xb7,0x66)
120: (162,162,162) = (0xa2,0xa2,0xa2)
121: ( 63, 63, 63) = (0x3f,0x3f,0x3f)
122: ( 8, 8, 8) = (0x08,0x08,0x08)
123: (125,153,125) = (0x7d,0x99,0x7d)
124: (227,210,177) = (0xe3,0xd2,0xb1)
125: (180,157,116) = (0xb4,0x9d,0x74)
126: (191,217,174) = (0xbf,0xd9,0xae)
127: (227,223,215) = (0xe3,0xdf,0xd7)
128: (127,177,127) = (0x7f,0xb1,0x7f)
129: (227,165, 52) = (0xe3,0xa5,0x34)
130: (173,159,135) = (0xad,0x9f,0x87)
131: (159,154,146) = (0x9f,0x9a,0x92)
132: (223,191, 86) = (0xdf,0xbf,0x56)
133: (151,191,117) = (0x97,0xbf,0x75)
134: (207,159, 71) = (0xcf,0x9f,0x47)
135: (114,171,114) = (0x72,0xab,0x72)
136: (173,155,122) = (0xad,0x9b,0x7a)
137: (121,150,121) = (0x79,0x96,0x79)
138: (148,164,148) = (0x94,0xa4,0x94)
139: (127,185,110) = (0x7f,0xb9,0x6e)
140: (125,159,125) = (0x7d,0x9f,0x7d)
141: (111,153,111) = (0x6f,0x99,0x6f)
142: ( 97,148, 97) = (0x61,0x94,0x61)
143: (120,184,120) = (0x78,0xb8,0x78)
144: (162,171,162) = (0xa2,0xab,0xa2)
145: (168,184,168) = (0xa8,0xb8,0xa8)
146: (130,155,130) = (0x82,0x9b,0x82)
147: (181,176, 63) = (0xb5,0xb0,0x3f)
148: ( 10,129, 10) = (0x0a,0x81,0x0a)
149: (163,179, 78) = (0xa3,0xb3,0x4e)
150: (122,148,122) = (0x7a,0x94,0x7a)
151: (136,184,102) = (0x88,0xb8,0x66)
152: (124,180,124) = (0x7c,0xb4,0x7c)
153: ( 30,132, 30) = (0x1e,0x84,0x1e)
154: (154,181, 86) = (0x9a,0xb5,0x56)
155: (200,177,136) = (0xc8,0xb1,0x88)
156: ( 20,131, 20) = (0x14,0x83,0x14)
157: (200,172,120) = (0xc8,0xac,0x78)
158: (142,151,142) = (0x8e,0x97,0x8e)
159: ( 14, 14, 14) = (0x0e,0x0e,0x0e)
160: (174,214,174) = (0xae,0xd6,0xae)
161: (255, 84, 84) = (0xff,0x54,0x54)
OK: test.pngquant.png (399x199, 8-bit palette, non-interlaced, 90.2%).
File: test.pngquant.zopflipng.png (6963 bytes)
PLTE chunk: 162 palette entries
0: (255,255,255) = (0xff,0xff,0xff)
1: (153,153,153) = (0x99,0x99,0x99)
2: (118,118,118) = (0x76,0x76,0x76)
3: (187,187,187) = (0xbb,0xbb,0xbb)
4: (101,101,101) = (0x65,0x65,0x65)
5: ( 0, 0, 0) = (0x00,0x00,0x00)
6: ( 50, 50, 50) = (0x32,0x32,0x32)
7: (204,204,204) = (0xcc,0xcc,0xcc)
8: ( 16, 16, 16) = (0x10,0x10,0x10)
9: (221,221,221) = (0xdd,0xdd,0xdd)
10: ( 33, 33, 33) = (0x21,0x21,0x21)
11: (136,136,136) = (0x88,0x88,0x88)
12: (238,238,238) = (0xee,0xee,0xee)
13: ( 67, 67, 67) = (0x43,0x43,0x43)
14: ( 40, 40, 40) = (0x28,0x28,0x28)
15: (170,170,170) = (0xaa,0xaa,0xaa)
16: ( 84, 84, 84) = (0x54,0x54,0x54)
17: (234,234,234) = (0xea,0xea,0xea)
18: (227,227,227) = (0xe3,0xe3,0xe3)
19: (200,200,200) = (0xc8,0xc8,0xc8)
20: (180,180,180) = (0xb4,0xb4,0xb4)
21: (166,166,166) = (0xa6,0xa6,0xa6)
22: (248,248,248) = (0xf8,0xf8,0xf8)
23: ( 67,161, 67) = (0x43,0xa1,0x43)
24: ( 0,128, 0) = (0x00,0x80,0x00)
25: ( 40,134, 40) = (0x28,0x86,0x28)
26: (101,178,101) = (0x65,0xb2,0x65)
27: ( 81,141, 81) = (0x51,0x8d,0x51)
28: (241,241,241) = (0xf1,0xf1,0xf1)
29: (193,193,193) = (0xc1,0xc1,0xc1)
30: (118,187,118) = (0x76,0xbb,0x76)
31: (153,204,153) = (0x99,0xcc,0x99)
32: ( 16,136, 16) = (0x10,0x88,0x10)
33: (214,214,214) = (0xd6,0xd6,0xd6)
34: (192,196,192) = (0xc0,0xc4,0xc0)
35: (112,146,112) = (0x70,0x92,0x70)
36: (168,184,168) = (0xa8,0xb8,0xa8)
37: ( 33,144, 33) = (0x21,0x90,0x21)
38: (187,221,187) = (0xbb,0xdd,0xbb)
39: ( 31, 31, 31) = (0x1f,0x1f,0x1f)
40: ( 86, 86, 86) = (0x56,0x56,0x56)
41: (238,246,238) = (0xee,0xf6,0xee)
42: (136,195,136) = (0x88,0xc3,0x88)
43: (162,171,162) = (0xa2,0xab,0xa2)
44: (175,177,175) = (0xaf,0xb1,0xaf)
45: (255,231,187) = (0xff,0xe7,0xbb)
46: (255,206,118) = (0xff,0xce,0x76)
47: (255,200,101) = (0xff,0xc8,0x65)
48: (255,219,153) = (0xff,0xdb,0x99)
49: (255,249,238) = (0xff,0xf9,0xee)
50: (177,202,177) = (0xb1,0xca,0xb1)
51: (241,163, 20) = (0xf1,0xa3,0x14)
52: (214,160, 60) = (0xd6,0xa0,0x3c)
53: (255,165, 0) = (0xff,0xa5,0x00)
54: (255,182, 50) = (0xff,0xb6,0x32)
55: (255,237,204) = (0xff,0xed,0xcc)
56: (255,176, 33) = (0xff,0xb0,0x21)
57: (180,156,112) = (0xb4,0x9c,0x70)
58: (255,170, 16) = (0xff,0xaa,0x10)
59: (255,213,136) = (0xff,0xd5,0x88)
60: (227,161, 40) = (0xe3,0xa1,0x28)
61: (255,243,221) = (0xff,0xf3,0xdd)
62: (255,225,170) = (0xff,0xe1,0xaa)
63: (255,188, 67) = (0xff,0xbc,0x43)
64: ( 50,153, 50) = (0x32,0x99,0x32)
65: (255,194, 84) = (0xff,0xc2,0x54)
66: (248,220,168) = (0xf8,0xdc,0xa8)
67: (248,164, 10) = (0xf8,0xa4,0x0a)
68: (200,174,128) = (0xc8,0xae,0x80)
69: (234,195,124) = (0xea,0xc3,0x7c)
70: (234,162, 30) = (0xea,0xa2,0x1e)
71: (204,229,204) = (0xcc,0xe5,0xcc)
72: (159,159,159) = (0x9f,0x9f,0x9f)
73: (173,173,173) = (0xad,0xad,0xad)
74: (170,212,170) = (0xaa,0xd4,0xaa)
75: (207,207,207) = (0xcf,0xcf,0xcf)
76: (221,238,221) = (0xdd,0xee,0xdd)
77: ( 84,170, 84) = (0x54,0xaa,0x54)
78: (124,180,124) = (0x7c,0xb4,0x7c)
79: (120,184,120) = (0x78,0xb8,0x78)
80: ( 30,132, 30) = (0x1e,0x84,0x1e)
81: ( 10,129, 10) = (0x0a,0x81,0x0a)
82: ( 20,131, 20) = (0x14,0x83,0x14)
83: ( 60,137, 60) = (0x3c,0x89,0x3c)
84: (234,171, 56) = (0xea,0xab,0x38)
85: (200,158, 81) = (0xc8,0x9e,0x51)
86: (130,155,130) = (0x82,0x9b,0x82)
87: (142,151,142) = (0x8e,0x97,0x8e)
88: (122,148,122) = (0x7a,0x94,0x7a)
89: (139,159,139) = (0x8b,0x9f,0x8b)
90: ( 89,158, 89) = (0x59,0x9e,0x59)
91: (248,202,120) = (0xf8,0xca,0x78)
92: ( 17, 17, 17) = (0x11,0x11,0x11)
93: ( 8, 8, 8) = (0x08,0x08,0x08)
94: (207,159, 71) = (0xcf,0x9f,0x47)
95: (173,155,122) = (0xad,0x9b,0x7a)
96: (162,162,162) = (0xa2,0xa2,0xa2)
97: (137,137,137) = (0x89,0x89,0x89)
98: ( 63, 63, 63) = (0x3f,0x3f,0x3f)
99: (180,160,125) = (0xb4,0xa0,0x7d)
100: (180,172,157) = (0xb4,0xac,0x9d)
101: (180,173,162) = (0xb4,0xad,0xa2)
102: (180,167,143) = (0xb4,0xa7,0x8f)
103: (159,154,146) = (0x9f,0x9a,0x92)
104: (173,159,135) = (0xad,0x9f,0x87)
105: (180,157,116) = (0xb4,0x9d,0x74)
106: (227,165, 52) = (0xe3,0xa5,0x34)
107: (227,210,177) = (0xe3,0xd2,0xb1)
108: (227,223,215) = (0xe3,0xdf,0xd7)
109: (227,183,102) = (0xe3,0xb7,0x66)
110: ( 54, 54, 54) = (0x36,0x36,0x36)
111: (200,172,120) = (0xc8,0xac,0x78)
112: (200,177,136) = (0xc8,0xb1,0x88)
113: ( 97,148, 97) = (0x61,0x94,0x61)
114: (114,171,114) = (0x72,0xab,0x72)
115: (125,159,125) = (0x7d,0x9f,0x7d)
116: (111,153,111) = (0x6f,0x99,0x6f)
117: (127,177,127) = (0x7f,0xb1,0x7f)
118: (121,150,121) = (0x79,0x96,0x79)
119: (148,164,148) = (0x94,0xa4,0x94)
120: (125,153,125) = (0x7d,0x99,0x7d)
121: (116,162, 49) = (0x74,0xa2,0x31)
122: (209,202,124) = (0xd1,0xca,0x7c)
123: (223,191, 86) = (0xdf,0xbf,0x56)
124: (191,217,174) = (0xbf,0xd9,0xae)
125: (154,181, 86) = (0x9a,0xb5,0x56)
126: (191,175, 54) = (0xbf,0xaf,0x36)
127: (163,179, 78) = (0xa3,0xb3,0x4e)
128: (127,185,110) = (0x7f,0xb9,0x6e)
129: (136,184,102) = (0x88,0xb8,0x66)
130: (181,176, 63) = (0xb5,0xb0,0x3f)
131: (151,191,117) = (0x97,0xbf,0x75)
132: (174,214,174) = (0xae,0xd6,0xae)
133: (238,238,255) = (0xee,0xee,0xff)
134: (170,170,255) = (0xaa,0xaa,0xff)
135: (118,118,255) = (0x76,0x76,0xff)
136: ( 67, 67,255) = (0x43,0x43,0xff)
137: ( 16, 16,255) = (0x10,0x10,0xff)
138: ( 50, 50,255) = (0x32,0x32,0xff)
139: ( 0, 0,255) = (0x00,0x00,0xff)
140: (153,153,255) = (0x99,0x99,0xff)
141: (255,187,187) = (0xff,0xbb,0xbb)
142: (255,118,118) = (0xff,0x76,0x76)
143: (255, 84, 84) = (0xff,0x54,0x54)
144: (255, 67, 67) = (0xff,0x43,0x43)
145: (255,101,101) = (0xff,0x65,0x65)
146: (204,204,255) = (0xcc,0xcc,0xff)
147: (101,101,255) = (0x65,0x65,0xff)
148: ( 84, 84,255) = (0x54,0x54,0xff)
149: (136,136,255) = (0x88,0x88,0xff)
150: (187,187,255) = (0xbb,0xbb,0xff)
151: (221,221,255) = (0xdd,0xdd,0xff)
152: (154,130,187) = (0x9a,0x82,0xbb)
153: (255, 0, 0) = (0xff,0x00,0x00)
154: ( 33, 33,255) = (0x21,0x21,0xff)
155: (255,221,221) = (0xff,0xdd,0xdd)
156: ( 92, 92, 92) = (0x5c,0x5c,0x5c)
157: ( 39, 39, 39) = (0x27,0x27,0x27)
158: ( 25, 25, 25) = (0x19,0x19,0x19)
159: ( 14, 14, 14) = (0x0e,0x0e,0x0e)
160: (112,112,112) = (0x70,0x70,0x70)
161: (102,102,102) = (0x66,0x66,0x66)
OK: test.pngquant.zopflipng.png (399x199, 8-bit palette, non-interlaced, 91.2%).
File: test.oxipng.png (7065 bytes)
PLTE chunk: 162 palette entries
0: (255,255,255) = (0xff,0xff,0xff)
1: (255,249,238) = (0xff,0xf9,0xee)
2: (248,248,248) = (0xf8,0xf8,0xf8)
3: (255,243,221) = (0xff,0xf3,0xdd)
4: (238,246,238) = (0xee,0xf6,0xee)
5: (241,241,241) = (0xf1,0xf1,0xf1)
6: (238,238,255) = (0xee,0xee,0xff)
7: (255,237,204) = (0xff,0xed,0xcc)
8: (238,238,238) = (0xee,0xee,0xee)
9: (234,234,234) = (0xea,0xea,0xea)
10: (255,231,187) = (0xff,0xe7,0xbb)
11: (255,221,221) = (0xff,0xdd,0xdd)
12: (221,238,221) = (0xdd,0xee,0xdd)
13: (255,225,170) = (0xff,0xe1,0xaa)
14: (227,227,227) = (0xe3,0xe3,0xe3)
15: (221,221,255) = (0xdd,0xdd,0xff)
16: (227,223,215) = (0xe3,0xdf,0xd7)
17: (248,220,168) = (0xf8,0xdc,0xa8)
18: (255,219,153) = (0xff,0xdb,0x99)
19: (221,221,221) = (0xdd,0xdd,0xdd)
20: (204,229,204) = (0xcc,0xe5,0xcc)
21: (255,213,136) = (0xff,0xd5,0x88)
22: (214,214,214) = (0xd6,0xd6,0xd6)
23: (227,210,177) = (0xe3,0xd2,0xb1)
24: (255,206,118) = (0xff,0xce,0x76)
25: (204,204,255) = (0xcc,0xcc,0xff)
26: (255,187,187) = (0xff,0xbb,0xbb)
27: (207,207,207) = (0xcf,0xcf,0xcf)
28: (187,221,187) = (0xbb,0xdd,0xbb)
29: (248,202,120) = (0xf8,0xca,0x78)
30: (255,200,101) = (0xff,0xc8,0x65)
31: (191,217,174) = (0xbf,0xd9,0xae)
32: (204,204,204) = (0xcc,0xcc,0xcc)
33: (200,200,200) = (0xc8,0xc8,0xc8)
34: (255,194, 84) = (0xff,0xc2,0x54)
35: (234,195,124) = (0xea,0xc3,0x7c)
36: (174,214,174) = (0xae,0xd6,0xae)
37: (209,202,124) = (0xd1,0xca,0x7c)
38: (187,187,255) = (0xbb,0xbb,0xff)
39: (170,212,170) = (0xaa,0xd4,0xaa)
40: (192,196,192) = (0xc0,0xc4,0xc0)
41: (255,188, 67) = (0xff,0xbc,0x43)
42: (193,193,193) = (0xc1,0xc1,0xc1)
43: (177,202,177) = (0xb1,0xca,0xb1)
44: (255,182, 50) = (0xff,0xb6,0x32)
45: (223,191, 86) = (0xdf,0xbf,0x56)
46: (187,187,187) = (0xbb,0xbb,0xbb)
47: (227,183,102) = (0xe3,0xb7,0x66)
48: (255,176, 33) = (0xff,0xb0,0x21)
49: (153,204,153) = (0x99,0xcc,0x99)
50: (180,180,180) = (0xb4,0xb4,0xb4)
51: (170,170,255) = (0xaa,0xaa,0xff)
52: (200,177,136) = (0xc8,0xb1,0x88)
53: (255,170, 16) = (0xff,0xaa,0x10)
54: (168,184,168) = (0xa8,0xb8,0xa8)
55: (234,171, 56) = (0xea,0xab,0x38)
56: (200,174,128) = (0xc8,0xae,0x80)
57: (175,177,175) = (0xaf,0xb1,0xaf)
58: (200,172,120) = (0xc8,0xac,0x78)
59: (180,173,162) = (0xb4,0xad,0xa2)
60: (255,165, 0) = (0xff,0xa5,0x00)
61: (173,173,173) = (0xad,0xad,0xad)
62: (180,172,157) = (0xb4,0xac,0x9d)
63: (248,164, 10) = (0xf8,0xa4,0x0a)
64: (227,165, 52) = (0xe3,0xa5,0x34)
65: (136,195,136) = (0x88,0xc3,0x88)
66: (151,191,117) = (0x97,0xbf,0x75)
67: (241,163, 20) = (0xf1,0xa3,0x14)
68: (170,170,170) = (0xaa,0xaa,0xaa)
69: (234,162, 30) = (0xea,0xa2,0x1e)
70: (180,167,143) = (0xb4,0xa7,0x8f)
71: (162,171,162) = (0xa2,0xab,0xa2)
72: (227,161, 40) = (0xe3,0xa1,0x28)
73: (166,166,166) = (0xa6,0xa6,0xa6)
74: (191,175, 54) = (0xbf,0xaf,0x36)
75: (214,160, 60) = (0xd6,0xa0,0x3c)
76: (153,153,255) = (0x99,0x99,0xff)
77: (181,176, 63) = (0xb5,0xb0,0x3f)
78: (207,159, 71) = (0xcf,0x9f,0x47)
79: (163,179, 78) = (0xa3,0xb3,0x4e)
80: (154,181, 86) = (0x9a,0xb5,0x56)
81: (162,162,162) = (0xa2,0xa2,0xa2)
82: (180,160,125) = (0xb4,0xa0,0x7d)
83: (200,158, 81) = (0xc8,0x9e,0x51)
84: (173,159,135) = (0xad,0x9f,0x87)
85: (136,184,102) = (0x88,0xb8,0x66)
86: (180,157,116) = (0xb4,0x9d,0x74)
87: (127,185,110) = (0x7f,0xb9,0x6e)
88: (159,159,159) = (0x9f,0x9f,0x9f)
89: (255,118,118) = (0xff,0x76,0x76)
90: (118,187,118) = (0x76,0xbb,0x76)
91: (180,156,112) = (0xb4,0x9c,0x70)
92: (120,184,120) = (0x78,0xb8,0x78)
93: (148,164,148) = (0x94,0xa4,0x94)
94: (124,180,124) = (0x7c,0xb4,0x7c)
95: (173,155,122) = (0xad,0x9b,0x7a)
96: (127,177,127) = (0x7f,0xb1,0x7f)
97: (159,154,146) = (0x9f,0x9a,0x92)
98: (153,153,153) = (0x99,0x99,0x99)
99: (139,159,139) = (0x8b,0x9f,0x8b)
100: (136,136,255) = (0x88,0x88,0xff)
101: (114,171,114) = (0x72,0xab,0x72)
102: (142,151,142) = (0x8e,0x97,0x8e)
103: (255,101,101) = (0xff,0x65,0x65)
104: (101,178,101) = (0x65,0xb2,0x65)
105: (125,159,125) = (0x7d,0x9f,0x7d)
106: (130,155,130) = (0x82,0x9b,0x82)
107: (154,130,187) = (0x9a,0x82,0xbb)
108: (125,153,125) = (0x7d,0x99,0x7d)
109: (121,150,121) = (0x79,0x96,0x79)
110: (122,148,122) = (0x7a,0x94,0x7a)
111: (137,137,137) = (0x89,0x89,0x89)
112: (136,136,136) = (0x88,0x88,0x88)
113: (111,153,111) = (0x6f,0x99,0x6f)
114: (116,162, 49) = (0x74,0xa2,0x31)
115: (255, 84, 84) = (0xff,0x54,0x54)
116: ( 84,170, 84) = (0x54,0xaa,0x54)
117: (118,118,255) = (0x76,0x76,0xff)
118: (112,146,112) = (0x70,0x92,0x70)
119: ( 89,158, 89) = (0x59,0x9e,0x59)
120: ( 97,148, 97) = (0x61,0x94,0x61)
121: (255, 67, 67) = (0xff,0x43,0x43)
122: ( 67,161, 67) = (0x43,0xa1,0x43)
123: (101,101,255) = (0x65,0x65,0xff)
124: (118,118,118) = (0x76,0x76,0x76)
125: ( 81,141, 81) = (0x51,0x8d,0x51)
126: (112,112,112) = (0x70,0x70,0x70)
127: ( 50,153, 50) = (0x32,0x99,0x32)
128: ( 60,137, 60) = (0x3c,0x89,0x3c)
129: ( 84, 84,255) = (0x54,0x54,0xff)
130: (102,102,102) = (0x66,0x66,0x66)
131: (101,101,101) = (0x65,0x65,0x65)
132: ( 33,144, 33) = (0x21,0x90,0x21)
133: ( 40,134, 40) = (0x28,0x86,0x28)
134: ( 92, 92, 92) = (0x5c,0x5c,0x5c)
135: ( 30,132, 30) = (0x1e,0x84,0x1e)
136: ( 67, 67,255) = (0x43,0x43,0xff)
137: ( 16,136, 16) = (0x10,0x88,0x10)
138: ( 86, 86, 86) = (0x56,0x56,0x56)
139: ( 20,131, 20) = (0x14,0x83,0x14)
140: ( 84, 84, 84) = (0x54,0x54,0x54)
141: ( 10,129, 10) = (0x0a,0x81,0x0a)
142: (255, 0, 0) = (0xff,0x00,0x00)
143: ( 0,128, 0) = (0x00,0x80,0x00)
144: ( 50, 50,255) = (0x32,0x32,0xff)
145: ( 67, 67, 67) = (0x43,0x43,0x43)
146: ( 63, 63, 63) = (0x3f,0x3f,0x3f)
147: ( 33, 33,255) = (0x21,0x21,0xff)
148: ( 54, 54, 54) = (0x36,0x36,0x36)
149: ( 50, 50, 50) = (0x32,0x32,0x32)
150: ( 16, 16,255) = (0x10,0x10,0xff)
151: ( 40, 40, 40) = (0x28,0x28,0x28)
152: ( 39, 39, 39) = (0x27,0x27,0x27)
153: ( 33, 33, 33) = (0x21,0x21,0x21)
154: ( 31, 31, 31) = (0x1f,0x1f,0x1f)
155: ( 0, 0,255) = (0x00,0x00,0xff)
156: ( 25, 25, 25) = (0x19,0x19,0x19)
157: ( 17, 17, 17) = (0x11,0x11,0x11)
158: ( 16, 16, 16) = (0x10,0x10,0x10)
159: ( 14, 14, 14) = (0x0e,0x0e,0x0e)
160: ( 8, 8, 8) = (0x08,0x08,0x08)
161: ( 0, 0, 0) = (0x00,0x00,0x00)
OK: test.oxipng.png (399x199, 8-bit palette, non-interlaced, 91.1%).
File: test.oxipng.zopflipng.png (6963 bytes)
PLTE chunk: 162 palette entries
0: (255,255,255) = (0xff,0xff,0xff)
1: (153,153,153) = (0x99,0x99,0x99)
2: (118,118,118) = (0x76,0x76,0x76)
3: (187,187,187) = (0xbb,0xbb,0xbb)
4: (101,101,101) = (0x65,0x65,0x65)
5: ( 0, 0, 0) = (0x00,0x00,0x00)
6: ( 50, 50, 50) = (0x32,0x32,0x32)
7: (204,204,204) = (0xcc,0xcc,0xcc)
8: ( 16, 16, 16) = (0x10,0x10,0x10)
9: (221,221,221) = (0xdd,0xdd,0xdd)
10: ( 33, 33, 33) = (0x21,0x21,0x21)
11: (136,136,136) = (0x88,0x88,0x88)
12: (238,238,238) = (0xee,0xee,0xee)
13: ( 67, 67, 67) = (0x43,0x43,0x43)
14: ( 40, 40, 40) = (0x28,0x28,0x28)
15: (170,170,170) = (0xaa,0xaa,0xaa)
16: ( 84, 84, 84) = (0x54,0x54,0x54)
17: (234,234,234) = (0xea,0xea,0xea)
18: (227,227,227) = (0xe3,0xe3,0xe3)
19: (200,200,200) = (0xc8,0xc8,0xc8)
20: (180,180,180) = (0xb4,0xb4,0xb4)
21: (166,166,166) = (0xa6,0xa6,0xa6)
22: (248,248,248) = (0xf8,0xf8,0xf8)
23: ( 67,161, 67) = (0x43,0xa1,0x43)
24: ( 0,128, 0) = (0x00,0x80,0x00)
25: ( 40,134, 40) = (0x28,0x86,0x28)
26: (101,178,101) = (0x65,0xb2,0x65)
27: ( 81,141, 81) = (0x51,0x8d,0x51)
28: (241,241,241) = (0xf1,0xf1,0xf1)
29: (193,193,193) = (0xc1,0xc1,0xc1)
30: (118,187,118) = (0x76,0xbb,0x76)
31: (153,204,153) = (0x99,0xcc,0x99)
32: ( 16,136, 16) = (0x10,0x88,0x10)
33: (214,214,214) = (0xd6,0xd6,0xd6)
34: (192,196,192) = (0xc0,0xc4,0xc0)
35: (112,146,112) = (0x70,0x92,0x70)
36: (168,184,168) = (0xa8,0xb8,0xa8)
37: ( 33,144, 33) = (0x21,0x90,0x21)
38: (187,221,187) = (0xbb,0xdd,0xbb)
39: ( 31, 31, 31) = (0x1f,0x1f,0x1f)
40: ( 86, 86, 86) = (0x56,0x56,0x56)
41: (238,246,238) = (0xee,0xf6,0xee)
42: (136,195,136) = (0x88,0xc3,0x88)
43: (162,171,162) = (0xa2,0xab,0xa2)
44: (175,177,175) = (0xaf,0xb1,0xaf)
45: (255,231,187) = (0xff,0xe7,0xbb)
46: (255,206,118) = (0xff,0xce,0x76)
47: (255,200,101) = (0xff,0xc8,0x65)
48: (255,219,153) = (0xff,0xdb,0x99)
49: (255,249,238) = (0xff,0xf9,0xee)
50: (177,202,177) = (0xb1,0xca,0xb1)
51: (241,163, 20) = (0xf1,0xa3,0x14)
52: (214,160, 60) = (0xd6,0xa0,0x3c)
53: (255,165, 0) = (0xff,0xa5,0x00)
54: (255,182, 50) = (0xff,0xb6,0x32)
55: (255,237,204) = (0xff,0xed,0xcc)
56: (255,176, 33) = (0xff,0xb0,0x21)
57: (180,156,112) = (0xb4,0x9c,0x70)
58: (255,170, 16) = (0xff,0xaa,0x10)
59: (255,213,136) = (0xff,0xd5,0x88)
60: (227,161, 40) = (0xe3,0xa1,0x28)
61: (255,243,221) = (0xff,0xf3,0xdd)
62: (255,225,170) = (0xff,0xe1,0xaa)
63: (255,188, 67) = (0xff,0xbc,0x43)
64: ( 50,153, 50) = (0x32,0x99,0x32)
65: (255,194, 84) = (0xff,0xc2,0x54)
66: (248,220,168) = (0xf8,0xdc,0xa8)
67: (248,164, 10) = (0xf8,0xa4,0x0a)
68: (200,174,128) = (0xc8,0xae,0x80)
69: (234,195,124) = (0xea,0xc3,0x7c)
70: (234,162, 30) = (0xea,0xa2,0x1e)
71: (204,229,204) = (0xcc,0xe5,0xcc)
72: (159,159,159) = (0x9f,0x9f,0x9f)
73: (173,173,173) = (0xad,0xad,0xad)
74: (170,212,170) = (0xaa,0xd4,0xaa)
75: (207,207,207) = (0xcf,0xcf,0xcf)
76: (221,238,221) = (0xdd,0xee,0xdd)
77: ( 84,170, 84) = (0x54,0xaa,0x54)
78: (124,180,124) = (0x7c,0xb4,0x7c)
79: (120,184,120) = (0x78,0xb8,0x78)
80: ( 30,132, 30) = (0x1e,0x84,0x1e)
81: ( 10,129, 10) = (0x0a,0x81,0x0a)
82: ( 20,131, 20) = (0x14,0x83,0x14)
83: ( 60,137, 60) = (0x3c,0x89,0x3c)
84: (234,171, 56) = (0xea,0xab,0x38)
85: (200,158, 81) = (0xc8,0x9e,0x51)
86: (130,155,130) = (0x82,0x9b,0x82)
87: (142,151,142) = (0x8e,0x97,0x8e)
88: (122,148,122) = (0x7a,0x94,0x7a)
89: (139,159,139) = (0x8b,0x9f,0x8b)
90: ( 89,158, 89) = (0x59,0x9e,0x59)
91: (248,202,120) = (0xf8,0xca,0x78)
92: ( 17, 17, 17) = (0x11,0x11,0x11)
93: ( 8, 8, 8) = (0x08,0x08,0x08)
94: (207,159, 71) = (0xcf,0x9f,0x47)
95: (173,155,122) = (0xad,0x9b,0x7a)
96: (162,162,162) = (0xa2,0xa2,0xa2)
97: (137,137,137) = (0x89,0x89,0x89)
98: ( 63, 63, 63) = (0x3f,0x3f,0x3f)
99: (180,160,125) = (0xb4,0xa0,0x7d)
100: (180,172,157) = (0xb4,0xac,0x9d)
101: (180,173,162) = (0xb4,0xad,0xa2)
102: (180,167,143) = (0xb4,0xa7,0x8f)
103: (159,154,146) = (0x9f,0x9a,0x92)
104: (173,159,135) = (0xad,0x9f,0x87)
105: (180,157,116) = (0xb4,0x9d,0x74)
106: (227,165, 52) = (0xe3,0xa5,0x34)
107: (227,210,177) = (0xe3,0xd2,0xb1)
108: (227,223,215) = (0xe3,0xdf,0xd7)
109: (227,183,102) = (0xe3,0xb7,0x66)
110: ( 54, 54, 54) = (0x36,0x36,0x36)
111: (200,172,120) = (0xc8,0xac,0x78)
112: (200,177,136) = (0xc8,0xb1,0x88)
113: ( 97,148, 97) = (0x61,0x94,0x61)
114: (114,171,114) = (0x72,0xab,0x72)
115: (125,159,125) = (0x7d,0x9f,0x7d)
116: (111,153,111) = (0x6f,0x99,0x6f)
117: (127,177,127) = (0x7f,0xb1,0x7f)
118: (121,150,121) = (0x79,0x96,0x79)
119: (148,164,148) = (0x94,0xa4,0x94)
120: (125,153,125) = (0x7d,0x99,0x7d)
121: (116,162, 49) = (0x74,0xa2,0x31)
122: (209,202,124) = (0xd1,0xca,0x7c)
123: (223,191, 86) = (0xdf,0xbf,0x56)
124: (191,217,174) = (0xbf,0xd9,0xae)
125: (154,181, 86) = (0x9a,0xb5,0x56)
126: (191,175, 54) = (0xbf,0xaf,0x36)
127: (163,179, 78) = (0xa3,0xb3,0x4e)
128: (127,185,110) = (0x7f,0xb9,0x6e)
129: (136,184,102) = (0x88,0xb8,0x66)
130: (181,176, 63) = (0xb5,0xb0,0x3f)
131: (151,191,117) = (0x97,0xbf,0x75)
132: (174,214,174) = (0xae,0xd6,0xae)
133: (238,238,255) = (0xee,0xee,0xff)
134: (170,170,255) = (0xaa,0xaa,0xff)
135: (118,118,255) = (0x76,0x76,0xff)
136: ( 67, 67,255) = (0x43,0x43,0xff)
137: ( 16, 16,255) = (0x10,0x10,0xff)
138: ( 50, 50,255) = (0x32,0x32,0xff)
139: ( 0, 0,255) = (0x00,0x00,0xff)
140: (153,153,255) = (0x99,0x99,0xff)
141: (255,187,187) = (0xff,0xbb,0xbb)
142: (255,118,118) = (0xff,0x76,0x76)
143: (255, 84, 84) = (0xff,0x54,0x54)
144: (255, 67, 67) = (0xff,0x43,0x43)
145: (255,101,101) = (0xff,0x65,0x65)
146: (204,204,255) = (0xcc,0xcc,0xff)
147: (101,101,255) = (0x65,0x65,0xff)
148: ( 84, 84,255) = (0x54,0x54,0xff)
149: (136,136,255) = (0x88,0x88,0xff)
150: (187,187,255) = (0xbb,0xbb,0xff)
151: (221,221,255) = (0xdd,0xdd,0xff)
152: (154,130,187) = (0x9a,0x82,0xbb)
153: (255, 0, 0) = (0xff,0x00,0x00)
154: ( 33, 33,255) = (0x21,0x21,0xff)
155: (255,221,221) = (0xff,0xdd,0xdd)
156: ( 92, 92, 92) = (0x5c,0x5c,0x5c)
157: ( 39, 39, 39) = (0x27,0x27,0x27)
158: ( 25, 25, 25) = (0x19,0x19,0x19)
159: ( 14, 14, 14) = (0x0e,0x0e,0x0e)
160: (112,112,112) = (0x70,0x70,0x70)
161: (102,102,102) = (0x66,0x66,0x66)
OK: test.oxipng.zopflipng.png (399x199, 8-bit palette, non-interlaced, 91.2%).
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andrews05
commented on August 19, 2024
1
Right, we can see here that zopflipng gives a different palette order than oxipng by itself, which likely explains the size difference. This is probably coincidental rather zopflipng just being "better" - afaik it doesn't actually have any explicit palette sorting algorithms. Chances are oxipng will be better on average (aside from the -m flag - oxipng internal zopfli is currently fixed to 15 iterations, unless you use the API).
I have been testing some other algorithms lately though (see #514) - if you post the image I could take a look and see if they help here.
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shssoichiro
commented on August 19, 2024
Oxipng already uses some of these techniques, but it looks like there are improvements to be gained here. I'll probably turn this into a meta issue and make sub-issues for each potential improvement, once I have time to go through the full list in detail.
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ghuls
commented on August 19, 2024
Thanks.
At https://blog.codinghorror.com/zopfli-optimization-literally-free-bandwidth/ you can find an image that almost not optimized with oxipng (- 28 bytes), while TruePNG does much better (- 7016 bytes).
# Download image.
$ wget https://blog.codinghorror.com/content/images/2016/01/PBF274-Adam_2-0.png
# Compress original PNG with oxipng max setting (zlib):
$ oxipng -o 6 --zm 1-9 --strip all --out PBF274-Adam_2-0.oxipng_o6_zm1_9.png PBF274-Adam_2-0.png
Processing: PBF274-Adam_2-0.png
800x1412 pixels, PNG format
4x8 bits/pixel, RGBA
IDAT size = 607025 bytes
File size = 607110 bytes
Trying: 1944 combinations
IDAT size = 607025 bytes (0 bytes decrease)
file size = 607082 bytes (28 bytes = 0.00% decrease)
Output: PBF274-Adam_2-0.oxipng_o6_zm1_9.png
# Compress original PNG with oxipng max setting (zopfli):
$ oxipng -o 6 --zopfli --strip all --out PBF274-Adam_2-0.oxipng_o6_zopfli.png PBF274-Adam_2-0.png
Processing: PBF274-Adam_2-0.png
800x1412 pixels, PNG format
4x8 bits/pixel, RGBA
IDAT size = 607025 bytes
File size = 607110 bytes
Trying: 6 combinations
Found better combination:
zc = 0 zm = 0 zs = 0 f = 0 581799 bytes
IDAT size = 581799 bytes (25226 bytes decrease)
file size = 581856 bytes (25254 bytes = 4.16% decrease)
Output: PBF274-Adam_2-0.oxipng_o6_zopfli.png
# Compress original PNG with TruePNG max setting:
$ wine TruePNG.exe PBF274-Adam_2-0.png /o max /out PBF274-Adam_2-0.truepng_max.png
TruePNG 0.6.2.2 : PNG Optimizer
by x128 (2010-2016)
[email protected]
Input file: PBF274-Adam_2-0.png | 607110 bytes
Image: 800x1412 pixels | 8 bits/sample | RGB & Alpha
Delta filter: None
Chunks: gAMA
Output format: 8 bits/sample | RGB & Alpha
Chunks: gAMA
try...
IDAT=600021 file=600094 complete=100%
extra...
best:
zc:9 zm:8 zs:0 fs-: f:0 IDAT=600021 file=600094
# Compress original PNG with zopflipng.
$ zopflipng --iterations=10 PBF274-Adam_2-0.png PBF274-Adam_2-0.zopflipng_it10.png
Optimizing PBF274-Adam_2-0.png
Input size: 607110 (592K)
Result size: 581721 (568K). Percentage of original: 95.818%
Result is smaller
# Compress oxipng optimized file (with zlib) with zopflipng.
$ zopflipng --iterations=10 PBF274-Adam_2-0.oxipng_o6_zm1_9.png PBF274-Adam_2-0.oxipng_o6_zm1_9.zopflipng_it10.png
Optimizing PBF274-Adam_2-0.oxipng_o6_zm1_9.png
Input size: 607082 (592K)
Result size: 581721 (568K). Percentage of original: 95.822%
Result is smaller
# Compress oxipng optimized file (with zopfli) with zopflipng.
$ zopflipng --iterations=10 PBF274-Adam_2-0.oxipng_o6_zopfli.png PBF274-Adam_2-0.oxipng_o6_zopfli.zopflipng_it10.png
Optimizing PBF274-Adam_2-0.oxipng_o6_zopfli.png
Input size: 581856 (568K)
Result size: 581721 (568K). Percentage of original: 99.977%
Result is smaller
# Compress TruePNG optimized PNG with zopflipng.
$ zopflipng --iterations=10 PBF274-Adam_2-0.truepng_max.png PBF274-Adam_2-0.truepng_max.zopflipng_it10.png
Optimizing PBF274-Adam_2-0.truepng_max.png
Input size: 600094 (586K)
Result size: 576829 (563K). Percentage of original: 96.123%
Result is smaller
# PNG filesizes:
$ stat --format '%n'$'\t''%s' PBF274-Adam_2-0.*png
PBF274-Adam_2-0.oxipng_o6_zm1_9.png 607082
PBF274-Adam_2-0.oxipng_o6_zm1_9.zopflipng_it10.png 581721
PBF274-Adam_2-0.oxipng_o6_zopfli.png 581856
PBF274-Adam_2-0.oxipng_o6_zopfli.zopflipng_it10.png 581721
PBF274-Adam_2-0.png 607110
PBF274-Adam_2-0.truepng_max.png 600094
PBF274-Adam_2-0.truepng_max.zopflipng_it10.png 576829
PBF274-Adam_2-0.zopflipng_it10.png 581721from oxipng.
polarathene
commented on August 19, 2024
I might not have used TruePNG correctly, but on my input it's barely better than what I could get with oxipng... yet whatever compressor.io is doing, it's able to do huge reductions by comparison with image quality that looks the same.
oxipng -o 6 -i 0 --strip all svg_primitive.png = 60.4KiB
truepng -o4 -g0 -i0 -l -md remove all svg_primitive.png -out svg_primitive_truepng.png (both gave the same result, this was run on Arch Linux via the AUR package using WINE, no actual output image was created but the source file did change in size, so I assume it's working?)
truepng -fe -a1 -g0 -i0 -l -m=1 -cq c=256 -md remove all svg_primitive.png -out svg_primitive_truepng.png
Update: Seems to only accept one option input at a time... and any args(like -l or -cq has) seem ineffective :( Used /l(lossy) followed by /o4 which applied most of the above and a /cq, got 24.3KiB vs 59KiB initially getting.
Compress.io Lossy setting, 29.2KiB
Original at 62.7KiB
Would be nice if there are any easy wins there for oxipng to offer a lossy output option too :)
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TPS
commented on August 19, 2024
1 note: Be careful that you don't replicate TruePNG's faults (e.g., it can destroy certain 2-bit grayscale PNGs in a weird almost-interlaced fashion).
@javiergutierrezchamorro I've filed an extensive bug report re: this for FO.
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TPS
commented on August 19, 2024
#502 completed №3 (#73) above.
@guls, @shssoichiro: Could that be checked off in the top post?
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TPS
commented on August 19, 2024
Be aware that there's a vast amount of work in OxiPNG since v8.0 release (& more still in-process) so, if you're not building from sources/PRs, you've still not witnessed OxiPNG's current best.
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TPS
commented on August 19, 2024
In the mean time I switched from TruePNG to
pngquant+zopflipngfor the specific type of images I had (final filesize was very close toTruePNG+zopflipng.
-Zzopfli option does not work as good as the externalzopflipngCLI tool for reducing the size.
@ghuls Are all your PNGs ≤256 colors? If not, pngquant will be lossy & not a proper comparison against oxipng. A more correct comparison would be pngquant+oxipng vs pngquant+zopflipng.
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TPS
commented on August 19, 2024
but the image can be made smaller for both when running
zopflipngon both.
(although the -Z option should already have done a zopflipng like pass).
IIUC, #414 → #495 &/or #169 (comment) would solve this, also.
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andrews05
commented on August 19, 2024
@ghuls I suspect the difference may be due to palette order - oxipng only sorts by luminance while zopfli (or pngquant) may try different methods which happen to better here. Try using pngcheck -p to print the palettes and see if there's a difference.
Are you using original zopfli or a fork?
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ghuls
commented on August 19, 2024
@andrews05 Here is the image:
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andrews05
commented on August 19, 2024
Thanks. Sadly though, the new palette sorting did not improve this image.
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Related Issues (20)
- Images with a larger filesize after optimization are still overwritten HOT 6
- Question does oxipng optimization slow loading? HOT 8
- Noisy logs in INFO category during processing HOT 3
- If size the same, revert to original file HOT 2
- Chooses 2-bit grayscale over 1-bit indexed HOT 12
- Parallel mode hangs when invoked from Rayon global thread pool HOT 25
- Is arm64 / aarch64 architecture supported? HOT 6
- Any way to disable "binary" feature by default? HOT 1
- Use customizable or user-supplied BufWriter for Zopfli HOT 12
- "Qualifying round" optimization HOT 2
- Add man page for the command-line utility HOT 8
- Support Windows 32 bit (x86) builds HOT 5
- Portable Network Graphics (PNG) Specification (Third Edition) W3C Working Draft 20 July 2023 HOT 2
- Tolerate lowercase `-z` parameter HOT 6
- Console log colors should have good contrast for readability and accessibility HOT 4
- RFC: Removing the `backup` option HOT 24
- Option for target size HOT 11
- [Feature request] Allow specifying a range for `-zc`. HOT 3
- `--recursive` flag trys to compress non png files HOT 6
- Allow continue compressing after abortion HOT 5
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