image2pixels

Opens and converts image to pixels

Install

npm install image2pixels

Usage

Syntax: image2pixels ( imagePath, [options], callback )

Arguments

• imagePath String
• options Object (optional)
  • GD Boolean (optional) Wether to return a GD obj or raw array. Defaults to false
  • pixelsCallback Function` (optional) A callback function which receives the raw pixel array before it is returned or processed. Must return the (un)modified array.
• callback Function
  • err - if there was an error otherwise this will be null.
  • output - node-gd object or array of row objects.

Example

Taken from the example/example.js

var image2pixels = require('../index.js')
  , _ = require('underscore')
  , fs = require('fs');
 
 
// Output first row to json
image2pixels('input.jpg', // { GD: false } // default
    function (err, output) {
        if(err) console.log(err);
        fs.writeFile('output-first-row.json', JSON.stringify(output.slice(0,1), undefined, 2), 'utf8', function (err) {
            if(err) console.log(err);
        });
    });
 
 
// Save Image as png
image2pixels('input.jpg', { GD: true },
    function (err, output) {
        if(err) console.log(err);
        output.savePng('output.png', 0, function (err)
        {
            if(err) console.log(err);
        });
    });
 
// Recreate the "sorted pixels" effect from node-pixel-sort
image2pixels('input.jpg', { GD: true, pixelsCallback: sortPixels },
    function (err, output) {
        if(err) console.log(err);
        output.savePng('output-sorted.png', 0, function (err)
        {
            if(err) console.log(err);
        });
    });
 
function sortPixels (pixels) {
    var height = pixels.length
      , width = pixels[0].length
      , sortedpixels = _.sortBy(_.flatten(pixels), function (pixel) {
            return pixel.red + pixel.green + pixel.blue;
        })
      , output = []
    for(var i = 0; i < height; i++) {
        output.push([]);
        for(var j = 0; j < width; j++) {
            var pixel = sortedpixels[i*width + j]
            output[i].push(pixel);
        }
    }
    return output;
}