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special HDRI gamma value
Posted: Thu Feb 08, 2007 8:28 pm
by Micha
Hallo,
could it be possible to set a special gamma value for HDRI display only. All my HDRI (HDR format) are based on gamma 1 and I would like to set it at gamma 2.2.
Best regards,
Micha
Re: special HDRI gamma value
Posted: Fri Feb 09, 2007 6:50 am
by xnview
Micha wrote:Hallo,
could it be possible to set a special gamma value for HDRI display only. All my HDRI (HDR format) are based on gamma 1 and I would like to set it at gamma 2.2.
Ok, added in my TODO list
Posted: Sun Feb 11, 2007 1:13 am
by Micha
Thank you.
Posted: Fri Feb 15, 2008 12:10 pm
by Florian
Hi,
that would be nice. Also some HDR Foramts have a exposure value in the header so that they are displayed correctly. Right now it seems that XNView does not read that value when displaying HDRI Files. When viewing such files in Photoshop, they are displayed with the correct gamma.
http://local.wasp.uwa.edu.au/~pbourke/dataformats/pic/
Cheers, Florian
Posted: Mon Feb 18, 2008 1:58 pm
by xnview
One question, this gamma must be used only for viewing???
Perhaps a global gamma for HDRI & OpenEXR?
Posted: Mon Feb 18, 2008 2:31 pm
by Micha
If XnView could read the gamma value from the header, this would be the best. But if this isn't so easy, a global option would help too. Most of my HDRIs are gamma 1 based.
An advantage of the global option could be, that I can see, if a HDRI isn't gamma 1 based and looks wrong.
One question, this gamma must be used only for viewing???
For me yes. But a gamma conversation of multi selected images could be nice too.
Posted: Mon Feb 18, 2008 4:15 pm
by xnview
Micha wrote:
One question, this gamma must be used only for viewing???
For me yes. But a gamma conversation of multi selected images could be nice too.
So this gamma setting must in Option/General or in Option/Read-Write/Read/HDR?
Posted: Mon Feb 18, 2008 5:02 pm
by Micha
The HDR could be corrected for viewing of the thumbnail images and if the image is open. But I'm not sure, what is the best place for this option.
I think, RAW is a 32bit format like exr and hdr, so, we could do it like for RAW - exposure and gamma at the read options.