Hello, I'm running into what appears to be a regression. The ImageBufAlgo ociotransform used to work with only a LUT specified. It now seems to require that the OCIO environment variable points to a valid config, even if the LUT has nothing to do with the specified config. This issue shows up when using that operation from the oiiotool command line or via the Python bindings.
Secondarily, the invert options does seem to work for the Python bindings of the ociotransform operation. It works when called from oiiotool, so the problem would seem to be isolated to the Python bindings. Results and reproduction notes below. Does this sound familiar to anyone? Any help would be appreciated, HP export OCIO_LOGGING_LEVEL=debug # This breaks oiiotool test.exr --ociofiletransform /full/path/to/lut.csp -o test_lut.exr [OpenColorIO Info]: Color management disabled. (Specify the $OCIO environment variable to enable.) [OpenColorIO Debug]: This .ocio config has no environment section defined. The default behaviour is to load all environment variables (0), which reduces the efficiency of OCIO's caching. Considering predefining the environment variables used. oiiotool ERROR: ociofiletransform : Could not construct the color transform Full command line was: > oiiotool test.exr --ociofiletransform /full/path/to/lut.csp -o test_lut.exr # Now set OCIO to something export OCIO=/path/to/Nuke12.0v1.app/Contents/Resources/OCIOConfigs/configs/aces_1.1/config.ocio # This works oiiotool test.exr --ociofiletransform /full/path/to/lut.csp -o test_lut.exr [OpenColorIO Debug]: This .ocio config '/path/to/Nuke12.0v1.app/Contents/Resources/OCIOConfigs/configs/aces_1.1/config.ocio' has no environment section defined. The default behaviour is to load all environment variables (0), which reduces the efficiency of OCIO's caching. Considering predefining the environment variables used. [OpenColorIO Debug]: Opening /full/path/to/lut.csp [OpenColorIO Debug]: Loaded primary format cinespace [OpenColorIO Debug]: GPU Ops: Pre-3DLUT [OpenColorIO Debug]: GPU Ops: 3DLUT [OpenColorIO Debug]: Optimizing Op Vec... [OpenColorIO Debug]: Op 0: <FileNoOp> supports_gpu:1 [OpenColorIO Debug]: Op 1: <Lut1DOp> supports_gpu:0 [OpenColorIO Debug]: Op 2: <Lut3DOp> supports_gpu:0 [OpenColorIO Debug]: Optimized 3->2, 1 passes, 1 noops removed, 0 inverse ops removed [OpenColorIO Debug]: 0 ops combines [OpenColorIO Debug]: Op 0: <Lut1DOp> supports_gpu:0 [OpenColorIO Debug]: Op 1: <Lut3DOp> supports_gpu:0 [OpenColorIO Debug]: GPU Ops: Post-3DLUT [OpenColorIO Debug]: CPU Ops [OpenColorIO Debug]: Optimizing Op Vec... [OpenColorIO Debug]: Op 0: <FileNoOp> supports_gpu:1 [OpenColorIO Debug]: Op 1: <Lut1DOp> supports_gpu:0 [OpenColorIO Debug]: Op 2: <Lut3DOp> supports_gpu:0 [OpenColorIO Debug]: Optimized 3->2, 1 passes, 1 noops removed, 0 inverse ops removed [OpenColorIO Debug]: 0 ops combines [OpenColorIO Debug]: Op 0: <Lut1DOp> supports_gpu:0 [OpenColorIO Debug]: Op 1: <Lut3DOp> supports_gpu:0 Tested with OpenImageIO.VERSION = 10813 OpenImageIO.VERSION = 20008L opencolorio-1.1.0 https://github.com/OpenImageIO/oiio/blob/master/src/libOpenImageIO/color_ocio.cpp#L281 https://github.com/OpenImageIO/oiio/blame/d71ac830c966fcc2bc05349e1eebc0b883a352f3/src/libOpenImageIO/color_ocio.cpp#L281 Example script that exercises the functionality https://github.com/hpd/general/blob/master/hdr/python/mkhdr.py Example lut https://github.com/hpd/general/blob/master/hdr/curves/thetas.spi1d Example command line python mkhdr.py -r /path/to/thetas.spi1d —I /path/to/a.jpg -o /path/to/b.exr -b 0
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