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PODo iOS Core Image Blend Modes differ from Photoshop Blend Modes?
 

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  1. PODo iOS Core Image Blend Modes differ from Photoshop Blend Modes?
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    <p>I am using CIFilter and the CIHueBlendMode in order to blend an image (foreground) and a red layer (background)</p> <p>I am doing the exact same thing in Photoshop CS6 with the Hue Blend Mode (copied the foreground image and used the same red to fill the background layer)</p> <p>Unfortunately the results are very different: <img src="https://i.stack.imgur.com/Dh4Gp.png" alt="enter image description here"> (and the same applies to comparing CIColorBlendMode, CIDifferenceBlendMode and CISaturationBlendMode with their Photoshop counterparts)</p> <p>My question is: Is it me? Am I doing something wrong here? Or are Core Image Blend Modes and Photoshop Blend Modes altogether different things?</p> <pre><code>// Blending the input image with a red image CIFilter* composite = [CIFilter filterWithName:@"CIHueBlendMode"]; [composite setValue:inputImage forKey:@"inputImage"]; [composite setValue:redImage forKey:@"inputBackgroundImage"]; CIImage *outputImage = [composite outputImage]; CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]]; imageView.image = [UIImage imageWithCGImage:cgimg]; CGImageRelease(cgimg); // This is how I create the red image: - (CIImage *)imageWithColor:(UIColor *)color inRect:(CGRect)rect { UIGraphicsBeginImageContext(rect.size); CGContextRef _context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(_context, [color CGColor]); CGContextFillRect(_context, rect); UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return [[CIImage alloc] initWithCGImage:image.CGImage options:nil]; } </code></pre>
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    1. USTom
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    1. COI can't give a comprehensive answer to this, but I think it has to do with Photoshop and Core Image using different color models. The [Wikipedia article on blend modes](http://en.wikipedia.org/wiki/Blend_modes#Hue.2C_saturation_and_luminosity) notes: "Photoshop’s hue, saturation, color, and luminosity blend modes are based on a color space with dimensions that the article HSL and HSV calls hue, chroma, and luma. Note that this space is different from both HSL and HSV..." – while Core Image seems to use HSL.
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      1. USomz
    2. COThat's an interesting thought and definitely a good starting point for further research on my behalf. Thanks!
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