This applies to files when saving from image editor and when saving
render result.
Currently only works for images which has got float buffer and saving
happens to byte formats (such as PNG, JPEG). Also supports applying
color management for preview jpegs when main buffer is saving into
OpenEXR file.
As default transform when saving from image editor would be the same
settings as image editor uses itself.
Defaults for color correction of rendered images would be default
display name, no view transform and default values for gamma and
exposure.
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