[Tig] MacBook Pro colorimetry

[Lewis Saunders]

> glenn chan <glennchan at gmail.com> wrote:
> If you change the color profile to sRGB (which should get around some
> of the color management), the banding goes away.  Why?  I have no
> idea.

Because the color management is being disabled :)  I'm not sure why  
all those profiles appear in Display Prefs... half of them are  
working spaces rather than monitor profiles, so have basically no  
effect.  If you take a look at the profiles with ColorSync Ultility  
you can see that the sRGB-IEC one has no video card table in it so  
will do nothing, the "sRGB Profile" one does but I think it's just a  
gamma function, no calibrated curve.

If you have a profile with a video card table loaded, everything  
onscreen goes through that LUT.  If your device is only 8 or 6 bit,  
and you go through any LUT, you're going to get banding in  
gradients :)  For smooth gradients, don't use a LUT - load the sRGB- 
IEC profile and the video card LUT will be disabled.  Of course  
you'll have no calibration so nothing will match... but it'll be  
smooth :)

Lewis Saunders
Shake artist
London