OpenEXR incorrect gamma and missing alpha

[harumscarum]

here is problem with 32bits OpenEXR image - missing alpha and incorrect gamma on thumbnails and in the viewer
both same files are opened in MP and Bridge

http://dl.dropbox.com/u/2069868/web/night_0001.exr

[thibaud]

for previews/view mode
just hit ctrl+h (or "view" > "use alpha channel")
ctrl+M (or "view" > "show alpha") is quite handy too...
now that's actually feature richer than Bridge isn't it ?

As for the gamma issue, maybe it has to do with the color profile used here "sRGB IEC61966-2.1 (linear)" ?
for what it's worth Photoshop and Fusion don't seem to interpret the color space and gamma automatically for this file either. (ae and Nuke do though).

[harumscarum]

"use alpha channel" affects only Viewer, but not Thumbnails (rebuild it didnt help)

Photoshop and Bridge view and open this EXR with correct colorspace (maybe because of OpenEXR plugin installed)

[thibaud]

I suppose the use alpha for thumbnail is something I can live with... as the viewer gives more control.
in any case, if additional functionality for how thumbnail uses the alpha was to be implemented IMO this is not something that should be generic or even file format base but rather thumbnail based.
for reference this is how some other app handle that: (format specific context menu on the thumbnail)

.psd thumbnail context menu:


.exr thumbnail context menu (note the "Default transparency" to revert to format specific default because Opaque was choosen):

Photoshop and Bridge view and open this EXR with correct colorspace (maybe because of OpenEXR plugin installed)

you're right Photoshop does display it correctly (I had "proof color" turned on my first test which disabled the gamma correction)

[harumscarum]

there is correct gamma in Bridge from CS6 version

[thibaud]

Yes, it would be great if this gamma issue could be fixed.

[xnview]

You would like to view alpha in thumbnail?
Currently i don't know how to get gamma for OpenEXR

You can change default gamma for openEXR (Load settings>OpenExr>Gamma), 2.2 is better

[jho]

Hi xnview,
first of all I would appreciate your great work.

I have the same exact problem with the alpha in the thumbnails. My picture has a black alpha channel. Now in the viewer the picture is shown correct but in the thumbnail view I see nothing because the alpha is black.

[jho]

Can you say if it is being fixed in the upcoming 0.54?

[jho]

I attached a screenshot where you can see that the thumbnail is not showing the red ball because in the alpha it is black.

[xnview]

I attached a screenshot where you can see that the thumbnail is not showing the red ball because in the alpha it is black.

could you send me the file?

[jho]

Hi,
thanks for the fast reply. When I am at home I can sent you the exr file.

[jho]

I have sent you the image to contact@<-- removed* --> : Subject is OpenEXR alpha

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[xnview]

Issue 65