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POHow can I create a template image to be colored at run time
 

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  1. POHow can I create a template image to be colored at run time
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    <p>I have an image that is an almost flat color. It's attached but, plain white so you can't see it easily.</p> <p><img src="https://i.stack.imgur.com/ZsTV3.png" alt="Sample image"> I would like to be able to dynamically color this image at runtime, but I need to do it in iOS 6 without using UIImageRenderingModeAlwaysTemplate.</p> <p>The images will all start plain white with minor gradients for rounded corners.</p> <p>So far my best attempt has been using GPUImage and a category on UIImage</p> <pre><code>@implementation UIImage (BPAdditions) - (UIImage *)imageWithColor:(UIColor *)color { GPUImageRGBFilter *stillImageFilter = [[GPUImageRGBFilter alloc] init]; CGFloat red = 0.0, green = 0.0, blue = 0.0, alpha =0.0; [color getRed:&amp;red green:&amp;green blue:&amp;blue alpha:&amp;alpha]; stillImageFilter.red = red; stillImageFilter.green = green; stillImageFilter.blue = blue; GPUImageChromaKeyFilter *stillImageFilter2 = [[GPUImageChromaKeyFilter alloc] init]; [stillImageFilter2 setColorToReplaceRed:0 green:0 blue:0]; stillImageFilter2.thresholdSensitivity = 0.2; stillImageFilter2.smoothing = 0; UIImage *img = [stillImageFilter imageByFilteringImage:self]; return [stillImageFilter2 imageByFilteringImage: img]; } </code></pre> <p>This would be ideal, except when I used the RGB filter it turns the clear background black. Then removing this with the chroma filter has varying quality depending on the color used.</p> <p>There is a possibility that the target color will be black, in which case this solution will fail entirely.</p>
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    1. USChris Mitchelmore
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    1. COThe image is fairly simple. Would it not be easier to create this as a `UIBezierPath` in a `UIView` and render it in `drawRect`. That way you have very easy control of the colour of it. You can use PaintCode to find the code for the path.
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      1. USFogmeister
    2. COIs there a compelling reason to apply color to an existing bitmap, rather than just adding a `UIView` with the appropriate color/gradient/corner rounding on it?
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      1. USRob
    3. COIts going to use all the assets in the app this way, some are not as trivial and requires a ton of work on my part to build. My intended way means i can have our designer build the images and I can colour them for individual colour schemes.
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      1. USChris Mitchelmore
 

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