Hue, Saturation, Lightness about jimp HOT 4 CLOSED

No specific methods at present - but it's an obvious gap.

You can roll your own using the image.scan method. If you do please send on your code and I'll add it. Or if you know of an open source (preferably MIT licensed) package that has these methods, or just link to the algorithms, then I can add them here.

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Thanks for your reply @oliver-moran

Having image.scan all we need to manipulate H, S and L are rgbToHsl and hslToRgb functions.

Then increasing hue by 50 would look somewhat like this:

var red = this.bitmap.data[idx];
var green = this.bitmap.data[idx+1];
var blue = this.bitmap.data[idx+2];

var out = utils._rgbToHsl(red, green, blue);
out.h += 50;

var cvrBack = utils._hslToRgb(out.h, out.s, out.l);

this.bitmap.data[idx] = cvrBack.r;
this.bitmap.data[idx+1] = cvrBack.g;
this.bitmap.data[idx+2] = cvrBack.b;

I have implemented rgbToHsl and hslToRgb functions and was able to achieve this:

BEFORE: https://dl.dropboxusercontent.com/u/6434207/other/jimp/lx-cozy--large.png
AFTER: https://dl.dropboxusercontent.com/u/6434207/other/jimp/lx-cozy--large--512.png

I need to test my code more before sharing, I will make a pull request as soon as I put it all together.

P. S. great library btw!

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Thanks! If you write it, I'll pull it in.

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See #50

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