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View Code? Open in Web Editor NEWTool for exploring extremely large images, open source from NASA
Tool for exploring extremely large images, open source from NASA
=== BigView === This is source for a suite of programs to view very large images. 1) Images must first be in PPM format 2) generate a .PAGED format image running genPaged on a .PPM 3) view a .PAGED file with showPaged --------- Building --------- $> perl ./makeLinks.pl $> make -j makeLinks.pl ensures all libs/apps are built with the same flags. Put locally-required build changes in the top-level Global.defs. --------- Examples --------- $> djpeg -grayscale 05-ra-03-humphrey-A061R1.jpg > 05-ra-03-humphrey-A061R1.ppm i---or--- $> jpegtopnm 05-ra-03-humphrey-A061R1.jpg > 05-ra-03-humphrey-A061R1.pp $> genPaged 05-ra-03-humphrey-A061R1.ppm ==== 05-ra-03-humphrey-A061R1.ppm ===== Format: Binary PGM Max Pixel Value = 255 Width = 956 Height = 962 Components = 1[1=grey,3=rgb] Bit Depth = 8 bits Pixel Size = 1 bytes Offset = 15 bytes P5 # Paged format with mipmaps: 256x256x1 = 65536 bytes per page # Level 0 : [956,962] => [4,4] = 16 pages starting at page 0 @ 444 bytes # Level 1 : [478,481] => [2,2] = 4 pages starting at page 16 @ 1049020 bytes # Level 2 : [239,240] => [1,1] = 1 pages starting at page 20 @ 1311164 bytes # ======================================== # Total pages = 21 # Total bytes = header + pages # = 444 + 1376256 = 1376700 956 962 255 Levels = 3 $> showPaged 05-ra-03-humphrey-A061R1.ppm.paged ===== 05-ra-03-humphrey-A061R1.ppm.paged ===== Format: Binary PGM Comment: Paged format with mipmaps: 256x256x1 = 65536 bytes per page: Comment: Level 0 : [956,962] => [4,4] = 16 pages starting at page 0 @ 444 bytes: Comment: Level 1 : [478,481] => [2,2] = 4 pages starting at page 16 @ 1049020 bytes: Comment: Level 2 : [239,240] => [1,1] = 1 pages starting at page 20 @ 1311164 bytes: Comment: ========================================: Comment: Total pages = 21: Comment: Total bytes = header + pages: Comment: = 444 + 1376256 = 1376700: Max Pixel Value = 255 Width = 956 Height = 962 Components = 1[1=grey,3=rgb] Bit Depth = 8 bits Pixel Size = 1 bytes Offset = 444 bytes # Level 0 : [956,962] => [4,4] = 16 pages # Level 1 : [478,481] => [2,2] = 4 pages # Level 2 : [239,240] => [1,1] = 1 pages maxTexPages = 86 Max LOD = 0
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