special HDRI gamma value

Ideas for improvements and requests for new features in XnView Classic

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Micha
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Joined: Thu Feb 08, 2007 12:51 pm

special HDRI gamma value

Postby Micha » Thu Feb 08, 2007 8:28 pm

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

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xnview
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Re: special HDRI gamma value

Postby xnview » Fri Feb 09, 2007 6:50 am

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
Pierre.

Micha
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Postby Micha » Sun Feb 11, 2007 1:13 am

Thank you. :)

Florian
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Postby Florian » Fri Feb 15, 2008 12:10 pm

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

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xnview
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Postby xnview » Mon Feb 18, 2008 1:58 pm

One question, this gamma must be used only for viewing???
Perhaps a global gamma for HDRI & OpenEXR?
Pierre.

Micha
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Postby Micha » Mon Feb 18, 2008 2:31 pm

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. :wink:

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.

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xnview
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Postby xnview » Mon Feb 18, 2008 4:15 pm

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?
Pierre.

Micha
Posts: 69
Joined: Thu Feb 08, 2007 12:51 pm

Postby Micha » Mon Feb 18, 2008 5:02 pm

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.


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