"Thorsten Froehlich" <tho### [at] trfde> schrieb im Newsbeitrag 
news:45c127c8@news.povray.org...
> Warp wrote:
>> Ben Chambers <ben### [at] pacificwebguycom> wrote:
>>> I have tested force replacing the gamma with PNGCrush, and replacing it
>>> with .4545 (1.0/2.2) results in an image that displays correctly in all
>>> programs.
>>
>>   I'm puzzled about why the gimp shows the image correctly regardless
>> of whether it has a gamma of 2.2 or 0.4545
>
> The libpng spec isn't completely conclusive as to what the right value
> should be ... so maybe they support both (that is if gamma is below 1 or
> something)
>
> Thorsten

Nope. The Gimp simply assumes that every png image is 2.2 gamma
corrected and is just lucky in this special case.

-Ive

Post a reply to this message