Alain wrote:
> povray nous apporta ses lumieres en ce 2005-11-11 21:35:
> 
>> Ard wrote:
>>
>>> Here is an image in support of
>>>
http://news.povray.org/povray.newusers/thread/%3Cweb.4373f7155849a475ed802ab30%40news.povray.org%3

>>>
>>>
>>> Briefly put, Mozilla and Firefox on a Linux box, and IE via an rdesktop
>>> session, display my POV-generated PNGs much more brightly than image
>>> viewers and POV's own image previewer display them.
>>>
>>> The full rant is available in p.newusers.  I sure would appreciate your
>>> advice on this one folks.
>>>
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>
>>     The gamma chunk in PNG images has given me nothing but trouble.
>> Every browser, every program, seems to (over)compensate for gamma in a 
>> different way.  The answer is to make sure the png file has
>> no gamma chunk in it.
>>     Here is what I do ..
>>     Render/create image to Targa (tga) file.  Open said Targa
>> file in gimp.  Save as a PNG from gimp.  In the file save dialog, make 
>> sure that the "save gamma" box is NOT checked.  Save.  You
>> have just written a png that contains no gamma.  End of problem.
>>
>>
> If I remember corectly, if you DON'T include "assumed_gamma" then your 
> PNG don't include gamma information. Correct me if I'm wrong.
> 

By first rendering to TGA, a file that that cannot have gamma 
information in it, you ensure that povray does not include
gamma information.

By loading the TGA (with no gamma in it) and *then* saving from
gimp as already mentioned, in such a way that no gamma is written,
you are assured of a clean no-gamma-info file.


-- 
to all the companies who wait until a large user base becomes
dependant on their freeware, then shafting said happy campers with
mandatory payment for continued usage. I spit on your grave.

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