The atcq from mattdesl

Possible to run in the command line?

This is super cool and I'm excited that you open-sourced it! I'm coming from a python background and I'd like to use the output somehow as a starting point for other programs. Is there a way to call this from the command line so I can script it? I tried using nodejs, but I got stuck trying to require the library properly.

Feel free to close it as this may be out of scope for supporting this use case.

const ATCQ = require('./atcq.js');
var getPixels = require("get-pixels");

var f_image = "./sample_image_small.jpg";

var pixels = getPixels(f_image, function(err, pixels) {
    if(err) {
	console.log("Bad image path")
	return;
    }
    console.log("got pixels", pixels)    
    
    const palette = ATCQ.quantizeSync(pixels, {
	maxColors: 32
    }); 
    console.log(palette);    
});

Which gave:

nodejs demo.js
got pixels View3dbuffer {
  data: <Buffer fe f9 f1 ff fe f9 ef ff fe f9 ef ff fc fa ed ff fd fb ee ff fe fc f1 ff fe fc f3 ff fd fb f2 ff fb fb ef ff fb fb ef ff fb fb f1 ff fb fb f1 ff fb fb ... >,
  shape: [ 200, 284, 4 ],
  stride: [ 4, 800, 1 ],
  offset: 0 }
/home/hoppeta/projects/palette/atcq/atcq.js:16
  atcq.quantize();
       ^

TypeError: atcq.quantize is not a function
    at Function.quantizeSync (/home/hoppeta/projects/palette/atcq/atcq.js:16:8)
    at /home/hoppeta/projects/palette/atcq/demo.js:19:26
    at handleJPEG (/home/hoppeta/projects/palette/atcq/node_modules/get-pixels/node-pixels.js:44:3)
    at doParse (/home/hoppeta/projects/palette/atcq/node_modules/get-pixels/node-pixels.js:114:7)
    at /home/hoppeta/projects/palette/atcq/node_modules/get-pixels/node-pixels.js:190:7
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:511:3)

Pathological inputs take extremely long to compute

I'm using the library to generate a palette for every image in a movie. For most images with a diverse palette the computation time is 4-5 seconds. However, for images with very little variation, like the credits at the end of a movie, the computation can take a minute or more. Is there a way to shortcut the algorithm if it can't build a proper palette?

>> time nodejs extract.js baboon.png 

real	0m4.877s
user	0m5.145s
sys	0m0.102s

>> time nodejs extract.js 00000000.jpg 
[{"weight":1,"hex":"#000000","R":0,"G":0,"B":0}]

real	1m41.776s
user	1m36.971s
sys	0m0.092s

The input image is attached here, the worst-case scenario for an all black screen

Experimenting with maxColors or targetColors doesn't seem to make a difference in the output.

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Possible to run in the command line?

Pathological inputs take extremely long to compute

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