Re: [hatari-devel] Gamma correction

[David Savinkoff <dsavnkff@xxxxxxxxx>]

----- Miro Kropáček wrote:
> Hi,
> 
> while looking and the SainT changelog
> <http://leonard.oxg.free.fr/SainT/versions.txt> I've noticed that it has
> been using gamma correction for some time and there is even a note
> <http://leonard.oxg.free.fr/SC1425/SC1425.html> about other emulators
> lacking this feature as well. So I did a couple of screen grabs, while I'm
> at Lotus frenzy ;)
> 
> Hatari:
> 
> [image: Inline image 1]
> 
> SainT (without SC 1224 emulation but with gamma correction):
> 
> [image: Inline image 2]
> 
> SainT (with SC 1224 emulation and with gamma correction):
> 
> [image: Inline image 3]
> 
> Falcon/RGB photo:
> 
> [image: Inline image 4]
> 
> Falcon/VGA photo (same monitor as used for the emulator grabs, btw):
> 
> [image: Inline image 5]
> 
> So it seems to be true -- Hatari screenshot is definitely darker than the
> others. I must admit, the SC 1224 emulation in SainT is quite cute, along
> with the floppy sound, it makes me feel very oldschool. :)
> 
> -- 
> MiKRO / Mystic Bytes
> http://mikro.atari.org

Gamma correction is critical when rotating, warping or scaling
a picture (especially smaller). If a picture is simply scaled up
by an integer factor, gamma correction is not used on any pixels
(re-sampling causes aliasing, thus the need for gamma correction).