Hi all,
I'm involved with GIMP development as it pertains to ICC profile color
management. GIMP is primarily used for processing photographic images
and for creating digital art.
We are having a discussion about whether it's OK to read and write
OpenEXR RGB files that aren't encoded using linear gamma RGB data.
Some of us have argued that:
* OpenEXR is a data container.
* Nothing in the OpenEXR specifications forbids reading or writing
non-linearly encoded RGB data.
* After opening the file in an ICC profile color managed editing
application, it should be up to the user to assign the correct ICC
profile to interpret the data.
Others have maintained that statements in the OpenEXR documentation such
as "By convention, OpenEXR stores scene-referred linear values in the
RGB floating-point numbers" (Technical Introduction to OpenEXR) should
be interpreted to mean that OpenEXR RGB data should always be encoded as
linear gamma data, and that reading and writing of non-linearly encoded
RGB data shouldn't be supported.
We were hoping you all could shed some light on this question.
Thanks in advance for advice as to whether there really is a requirement
that OpenEXR RGB data always be encoded linearly.
Elle Stone
--
http://ninedegreesbelow.com
Color management and free/libre photography
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