In a photography app, I'm chaining a series of CIFilters together to
process the image. I'm able to do the chain just fine, but I'm only
using a few filters at the moment. As I increase the length of this
chain, am I going to run into performance issues? Here's my code:
exposureFilter = [CIFilter filterWithName: @"CIExposureAdjust"
keysAndValues:
@"inputImage", inputImage,
@"inputEV", [NSNumber numberWithFloat: exposureValue],
nil];
outputImage = [exposureFilter valueForKey: @"outputImage"];
[exposureFilter retain];
zoomFilter = [CIFilter filterWithName: @"CILanczosScaleTransform"
keysAndValues:
@"inputImage", outputImage,
@"inputScale", [NSNumber numberWithFloat: mappedZoom],
@"inputAspectRatio", [NSNumber numberWithFloat: 1.0],
nil];
outputImage = [zoomFilter valueForKey: @"outputImage"];
[zoomFilter retain];
Obviously, it's easy to continue to add to this chain. Is this the
most efficient way to string multiple filters together? I can
probably use Quartz Composer to create a single image unit that does
all of the processing. Would that be any more efficient, or would it
be essentially the same result?
Thanks,
Josh
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