Update CLF test image from CLF working group (#1563) (#1567)

Signed-off-by: Doug Walker <[email protected]>
Signed-off-by: Patrick Hodoul <[email protected]>

Co-authored-by: doug-walker <[email protected]>

Author: hodoulp

share/clf/CLF_testImage.exr

@@ -0,0 +1,45 @@
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+<!-- Copyright Contributors to the OpenColorIO Project. -->
+
+The ACES project has had a working group focused on building a package of resources to aid in 
+the development of implementations and integrations of the Academy/ASC Common LUT Format (CLF).  
+These resources include the following:
+
+- An implementation guide
+- A collection of CLF test files
+- A source target image and reference images generated by processing it through the test CLFs
+
+The website for the CLF Implementation working group is here:
+
+[https://paper.dropbox.com/doc/CLF-Implementation-Virtual-Working-Group--BYL3SxNbCAEOmKl1Sd6TkNM5AQ-cGWer0ASqKzhIzG00FNpS](url)
+
+Because OpenColorIO is open source and has a very complete CLF implementation, it has been used 
+in the generation of the test kit.  For example, the recommended collection of CLF test files 
+consists of files in the OCIO unit tests, in the directory:  tests/data/files/clf/*
+
+Furthermore, the Python scripts and image adjacent to this README may be used as follows:
+
+
+### CLF_testImage.exr
+
+This is the source target image.  It samples the full domain of half-float values.  More 
+information about this target is available at:  
+
+[https://github.com/alexfry/CLFTestImage](url)
+
+
+### process_clf_test_frames.py
+
+This script will use OCIO to process the source target image through the collection of CLF test 
+files to produce the reference image set.
+
+
+### compare_clf_test_frames.py
+
+This script will use OpenImageIO to compare the reference images to a set of images processed 
+by another implementation and compare them to see if they are within the tolerance specified in 
+the CLF Implementation Guide.
+
+
+For more information, please refer to the CLF Implementation Guide and the usage instructions 
+in the individual scripts.