Re: photoshop config.ocio

Brendan Bolles <bre...@...>

On Dec 25, 2012, at 1:13 AM, Nishith Singhai wrote:

1) By thumb rule a lg10 to srgb8 in nuke and lg10 to srgb8 in after effects should give the same result. true or false.
2) what is the way to measure that output from nuke after applying lut is looking same as that of after effects. is there a measuring tool or is it based on the observation only.

Nuke and After Effects have different color space defaults, so it's very easy to import the same file into each and get different results with OpenColorIO. In fact, to get the programs to match up you need a good understanding of how each works. I wish it were simpler.

A good thing to do is get an image with an area you can easily sample with your mouse (like the Marci image) and check to make sure the values match in each program. Both programs will show a readout of the pixel value you hover over (in After Effects it's in the Info palette).

Nuke defaults to linear color space and automatically converts most file formats to linear unless you check the "Raw Data" checkbox in the Read node. If you're using OCIO to do color conversions, you'll probably want to check that box in every case. Cineon/DPX files will default to log, EXR to linear, and most others to sRGB.

After Effects, on the other hand, defaults to no color space, which basically means your monitor's color space, or sRGB. The one exception is EXR files, which will get converted from linear to sRGB with the default setup unless you check "Preserve RGB". There's more information about this in the PDF manual included with the After Effects plug-in.

If you're still having trouble, let me ask: which kind of file are you importing?


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