Hello, Is there a way to check the luts folder/the ocio config file for changes while runtime?
The background is that I would like to write an lut node for the compositor that allows to apply lookup tables via ocio conversion like color grading applications like Davinci Resolve do. The purpose is to be able to bake color grading setups into a simple 3d lut that may be applied in other projects and shared with other users easily. In contrast to the film response curves blender provides for the final color space transformation, an lut node makes it possible to use luts in every position of the grading workflow. For Example I may use premade luts for my Blackmagic camera to get a good starting point for further grading work. I have already written a proof-of-concept 3D lut editor addon for blender. http://blenderartists.org/forum/showthread.php?322805-Compositor-Addon-3D-LUT-Editor It sets up a 3d scene with a 3d lut cube whick can be manipulated and then creates a rudimentary node tree that uses the position values of the spheres in the lut for calculating the new picture. Now, the real purpose of the script would be to parse a new lut file into the ocio folder with the corresponding values of the created 3d lut and also make the entry into the ocio config file and then, if you manipulate the the 3d lut in blender, update the lut file and then make ocio update the luts it has loaded so that you can get a realtime preview of what you do using the compositor with the lut node. My plan to realize the update of the lut cache would be to implement a function to do this into the lut node which may be accessed by the user to update the lut list if he has added a downloaded lut to the folder and also by the python api so that the script may call it. By the way, does anyone know how to work with .cube luts coming from davinci resolve in ocio properly and in which color space they have to be applied? I have tried this one http://www.captainhook.co.nz/blackmagic-cinema-camera-lut/ by creating a new pseudo color space which interprets the input image as sRGB, converts it into Blender´s Linear space and then applies the lut, but this does not create the right results (You may simply try it out with the image pairs on the website if you like). Kind regards, Björn Sonnenschein _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
