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  1. PO
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    <p>You've been asking a lot about this hue shifting thing, so I figured I'd try to work out an example: <a href="http://jsfiddle.net/EMujN/3/" rel="nofollow">http://jsfiddle.net/EMujN/3/</a></p> <p>Here's another that uses an actual icon: <a href="http://jsfiddle.net/EMujN/4/" rel="nofollow">http://jsfiddle.net/EMujN/4/</a></p> <p>There's a lot in there. There's a huge data URL which you can ignore unless you want to <a href="http://dataurl.net/#dataurlmaker" rel="nofollow">replace it</a>. Here's the relevant part where we modify HSL.</p> <pre><code> //SHIFT H HERE var hMod = .3; hsl[0]=(hsl[0]+hMod)%1; //MODIFY S HERE var sMod = .6; hsl[1]=Math.max(0,Math.min(1, hsl[1]+sMod )); //MODIFY L HERE var lMod = 0; hsl[2]=Math.max(0,Math.min(1, hsl[2]+lMod )); </code></pre> <p>I've converted to HSL because it's a lot easier to accomplish what you want in that color space than RGB.</p> <p>Without getting any more complex, you have three variables you can tune: how much to add to either Hue, Saturation, or Lightness. I have the lightness variable set to 0 because any higher and you will see some nasty JPEG artifacts (if you can find a decent .png that would be better, but I went with the first CC night image I could find).</p> <p>I think the hue shift (yellow to green) looks pretty good though and I have maxed out the saturation, so even a normally white light appears bright purple. Like I said in my comment, you will need to increase the lightness and saturation if you want to colorize patches of black and white. Hopefully, you can figure out what you need from this example.</p> <p>image used: <a href="http://commons.wikimedia.org/wiki/File:Amman_(Jordan)_at_night.jpg" rel="nofollow">http://commons.wikimedia.org/wiki/File:Amman_(Jordan)_at_night.jpg</a></p>
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    1. POBest natural way of coloring an icon/sprite
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    1. USJere
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    1. COBasically the approach is clear but I'm not thinking about photis but icons sprites. The black is not the worst. The problem is that I wanna a general algorithm to regulate the hsv authomatically so it looks natural and it should be independent from the input. Another input is the predominant color.
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      1. USClaudio Ferraro
    2. COI've posted an icon example in my answer. "a general algorithm to regulate the hsv authomatically so it looks natural" You're being quite vague. I don't think you've made clear yet what your actual problem is... I thought you were confused on hue shifting. Some examples of colorings that you don't think are "natural" and some more detail would help. "The black is not the worst." .... the first thing you said was you were having problems with black.
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      1. USJere
    3. COYes it's a related thing. I wanna to color an image which predominant color may be black or any other color in the rgb. You told to me that I should regulate brightness and saturation too but I wanna the cpu do this for me
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      1. USClaudio Ferraro
 

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