Re: [Openexr-devel] OpenEXR files with nonlinearly encoded RGB

[Elle Stone]

On 02/23/2015 11:16 AM, Kai-Uwe Behrmann wrote:
> Am 20.02.2015 um 21:45 schrieb Elle Stone:
> > * 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.
>
> What speaks against Tiff as a container? By convention Tiff is already
> heavily ICC biased. So best changes to find many readers, which
> interprete the ICC profile correctly including the desired TRC.
>
> A different option is to use PPM, the high bit depth version, and
> compress and add meta data, ICC Profiles, outside. So it is well useable
> inside other containers, say OpenRaster and so simple to implement.

Floating point tiff doesn't seem to be as well supported as OpenEXR in 
the various free/libre editing applications. For example at present 
Krita 2.9 can't read or write a floating point tiff but reads and writes 
OpenEXR images with no problems.

Apparently the tiff specs encompass many different ways of writing an image.

From a user perspective, if tiff (or PPM) doesn't work for sharing high 
bit depth RGB data between ICC profile color managed editing 
applications, maybe the applications can read and write OpenEXR.