You are forcing the CIContext to process images in GenericRGB
colorspace instead of the default LinearRGB colorspace, which is not
recommended and is likely to give incorrect results. You should leave
kCIContextWorkingColorSpace to its default unless you have a very good
reason for it.
CIContexts used by QC always use the LinearRGB as the processing
colorspace.
On Dec 4, 2007, at 1:08 PM, Raphael Sebbe @ Google wrote:
Hi,
I have a few different pipelines rendering images, some QC-based,
some OpenGL/CI-based, some Quartz/CI-based. All have colorspaces
associated.
The QC-based renderings has a slightly different color output. I
think this is because my CI-based contexts have this setup, which
sems not possible to create through QCRenderer:
CGColorSpaceRef colorSpace =
CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
(id)colorSpace,kCIContextOutputColorSpace,
(id)colorSpace,kCIContextWorkingColorSpace,
nil];
_hiresImageContext = [CIContext
contextWithCGContext:_hiresGraphicsContext options:options];
The rendering are the same if options is set to nil in the CI-based
contexts. QCRenderer is created with this code:
CGColorSpaceRef colorSpace =
CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
id path = [[NSBundle mainBundle] pathForResource:@"HYTheater"
ofType:@"qtz" inDirectory:nil];
id composition = [QCComposition compositionWithFile:path];
_qcTheater = [[QCRenderer alloc] initWithCGLContext:[_openGLContext
CGLContextObj] pixelFormat:[_openGLPixelFormat CGLPixelFormatObj]
colorSpace:colorSpace composition:composition];
Any advice to setup the QCRenderer to render the same as CIContexts ?
Thanks,
Raphael
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