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this is a module designed to provide a lib of color space conversion functions and to provide filters for transforming pixels in a canvas image data array in wierd, fun, and useful ways.
PixelCore pixel core is the core object used to apply transforms on a canvas.
this is a standard object so extend it as you need =)
var PixelCore = require('canvasutil').PixelCore
, pixelProcessor = new PixelCore();
this is the only method defined in the prototype of PixelCore it accepts a node canvas as arg 1 and a transform callback as arg 2
pixelProcessor.iterate(Canvas,eachPixelCallback);
this is a value that may be used in transform callbacks that have a scaling behavior
pixelProcessor.threshold = 50;
the transforms object is a convience property to hold all available transform methods
pixelProcessor.transforms
this holds all grayscale flavors of transforms
pixelProcessor.transforms.grayscale
//the best grayscale transform is luma so use that one unless you have a specific need
pixelProcessor.transforms.grayscale.luma
and i have some other interesting transforms
//brightens everything below a threshold to threshold
//threshold range is 0-100
pixelProcessor.transforms.brightenThreshold
//whitens any pixel with a saturation greater than threshold
//threshold range is 0-100
pixelProcessor.transforms.saturationThreshold
//dims any pixel with a Luma greater than threshold. this is not the same as adding black
//threshold range is 0-255
pixelProcessor.transforms.dimThreshold
//lighten any pixel with a Luma less than threshold. this is not the same as adding white
//threshold range is 0-255
pixelProcessor.transforms.lightenThreshold
conversionLib conversion lib has all of the color space conversion functions.
all of these function exports take 3 arguments that are the 3 components of their colorspace all of these function return and array with the 3 components of the new color space
rgbToHsl(r,g,b)
hslToRgb(h.s.l)
rgbToHsv(r,g,b)
hsvToRgb(h,s,v)
rgbToYuv(r,g,b)
yuvToRgb(y,u,v)
this accepts r,g,b like the others bvut only returns the Y component of YUV
luma709Only(r,g,b)
i welcome pull requests for other helper methods for color conversion, opacity to color, hex to rgb etc. i feel that this is where they belong... for now =)
var Canvas = require('canvas')
, canvas = new Canvas(100,100)
,pxCore = new require('canvasutil').PixelCore;
,img = new Canvas.Image();
img.onload(function(){
var ctx = canvas.getContext('2d');
ctx.drawImage(img,0,0);
pxCore.threshold = 30;
pxCore.itterate(canvas,pxCore.transforms.brightenThreshold);
canvas.toDataURL(function(err,url){
console.log(url);
});
});
img.src = "some path to an image";
FAQs
Pixel transformations and processing for canvas
The npm package canvasutil receives a total of 3,614 weekly downloads. As such, canvasutil popularity was classified as popular.
We found that canvasutil demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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