[Openexr-devel] Color Space, white balance...

[Antoine Clappier]

Hi all!

The following is more a discussion than a direct question.

I am wondering what is the correct way to deal with Color Spaces in OpenEXR 
format and HDRI in general.

My current assumptions are that the HDRI data should be stored with minimal 
modifications. That is: linear values (gamma = 1), no white balance 
correction, etc.

Now, the end user should be able to recover image information such as white 
balance and recalculate the image for display from the HDR image data stored 
in the OpenEXR file.

This leads to the question to what should be stored in the EXR file? In what 
Color Space the HDR data should be stored?

Related discussion: I don't see in the Color Space literature how HDR data 
can be transformed from one space to another.


I realize that there is probably not a unique answer to my questions. I hope 
with this post to start a discussion on the subject and get some input from 
your various experiences!

Let me know what you think.

Regards,

Antoine Clappier