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POTrouble generating a mask image; CISourceOverCompositing not working as expected
 

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  1. POTrouble generating a mask image; CISourceOverCompositing not working as expected
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    <p>I'm basically trying to get the <a href="http://developer.apple.com/library/IOs/#documentation/GraphicsImaging/Conceptual/CoreImaging/ci_filer_recipes/ci_filter_recipes.html#//apple_ref/doc/uid/TP30001185-CH4-SW22" rel="nofollow">"Anonymous Faces Filter Recipe" example</a> to work in the iOS simulator.</p> <p>There are no errors or warnings, but it appears as though "CISourceOverCompositing" filter is not working as expected. The circles are being drawn on the maskImage destructively as opposed to additively. For example, if 5 faces are found, 5 circles are drawn but only the last is shown on the maskImage.</p> <p><strong>How can I make it so that each circle is drawn to the maskImage in an additive fashion?</strong></p> <p>Here is the code I'm using to build the mask:</p> <pre><code>// Create a green circle to cover the rects that are returned. CIImage *maskImage = nil; for (CIFeature *f in faces){ CIVector *circleCenter = [CIVector vectorWithX:f.bounds.origin.x+f.bounds.size.width/2.0 Y:f.bounds.origin.y+f.bounds.size.height/2.0]; CGFloat circleRadius = MIN([f bounds].size.width, [f bounds].size.height)/1.5; CIFilter *radialGradient = [CIFilter filterWithName:@"CIRadialGradient" keysAndValues: @"inputRadius0", [NSNumber numberWithFloat:circleRadius], @"inputRadius1", [NSNumber numberWithFloat:circleRadius+1.0f], @"inputColor0", [CIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0], @"inputColor1", [CIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0], @"inputCenter", circleCenter, nil]; CIImage *circleImage = [radialGradient valueForKey:@"outputImage"]; if (maskImage == nil) { maskImage = circleImage; } else { maskImage = [[CIFilter filterWithName:@"CISourceOverCompositing" keysAndValues:@"inputImage", circleImage, @"inputBackgroundImage",maskImage, nil] valueForKey:@"outputImage"]; } } </code></pre>
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    1. PTQuestion
    1. USmr.sosa
    1. USmr.sosa
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      1. POTrouble generating a mask image; CISourceOverCompositing not working as expected
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      1. VTUpMod
    1. COI got around this by using the "CIAdditionCompositing" filter instead. I would still like to know if this is bug or whether something is wrong with my code. Any insights would be much appreciated.
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      1. POTrouble generating a mask image; CISourceOverCompositing not working as expected
      1. USmr.sosa
    2. COYour fix (using `CIAdditionCompositing`) worked for me too, but I suspect that `CIMaximumCompositing` would be more appropriate here.
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      1. POTrouble generating a mask image; CISourceOverCompositing not working as expected
      1. USJean-Philippe Pellet
 

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