I did not see any clamping when I interposed a passthrough OpenCL kernel between your scaler and negative detector. Make sure you set the CL output to 32 bit and color space to Image Native or Absolute Linear. I got some odd artifacts when I set the output to Rendering Destination.
Here's my sample composition that shows (showed?) CL -> CI weirding out:
CLClamping.qtz
Description: application/quartzcomposer
However, after restarting QC it seems to be ok now ..... so you're right, it's fine in both cases. (it wasn't a color space or format issue, as they were all configured identically).
Is there any documentation on this?
OpenCL's documented on khronos' website ( http://www.khronos.org/registry/cl/specs/opencl-1.0.43.pdf )
CoreImage is documented on Apple's developer site ( http://developer.apple.com/mac/library/DOCUMENTATION/GraphicsImaging/Reference/CIKernelLangRef/ci_gslang_ext.html#/ /apple_ref/doc/uid/TP40004397-CH206-TPXREF101 )
The nuances (like 32bit mode, among other things) are somewhat QC- specific, and are probably not well documented. :/
-- [ christopher wright ] [email protected] http://kineme.net/
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