[CinePaint] OpenEXR default precission

Hello all,

I am working on the OpenEXR plug-in to support layered images for a 
animation/modelling application (blender).

The plug-in currently handles all input/output as Ilm::Half values. In 
theory this would be quick as it allowes to pass the buffer as is to 
the grafics board. But CinePaint (as of the Gtk version) does not take any 
advantage of it.
Nvidia/OpenEXR Half can hold 10-bit or 1024 steps for the 0...1 range.

In contrary blender writes its Z-buffers as float with 22-bit precission 
for the 0...1 range.

Now the intention is to open blender images, including Z-buffer, in 
CinePaint, edit and reopen in blender.

I am afraid the Float to/from Half conversions will be visible. Opinions? 

Putting an option into a popup window for saving as Half or Float is 
difficult. It would make the workflow clumsy while working in 
the flipbook. I tend to use Float entirely, accepting larger file sizes. 
Any other idea?

regards
Kai-Uwe Behrmann
--
development for color management 
www.behrmann.name + www.oyranos.org + www.cinepaint.org


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