Re: Display Gamma: Factory vs calibration vs working space
Re: Display Gamma: Factory vs calibration vs working space
- Subject: Re: Display Gamma: Factory vs calibration vs working space
- From: <email@hidden>
- Date: Wed, 17 Nov 2004 12:14:31 -0500
You will find the answer to your question in the following
document (which is the 1st version of the PNG spec but
which has good info on gamma):
http://www.libpng.org/pub/png/spec/1.0/png-1.0-w3c-single.html.gz
You should also look at the following thread on the same
subject going on a Rob Galbraith forum:
http://www.robgalbraith.com/ubbthreads/showflat.php?Cat=&Number=284067&page=0&view=collapsed&sb=5&o=&fpart=1
Danny Pascale
On Wed, 17 Nov 2004 11:12:46 -0500
"amadou diallo" <email@hidden> wrote:
The Eizo LCD is factory adjusted for 0-255 steps in a
2.2 gamma. I've calibrated the monitor to a 2.2 gamma
(6500k and 95cd/m). When creating b/w gradients in both
RGB and grayscale modes, PS working spaces with 2.2
gammas display with absolutely no banding. Work spaces
with gammas of 1.8 and 2.0 (custom) both show slight
banding towards the shadow end. AGP card is nvidia
geForce4 MX. My understanding has been that hardware
gamma, calibration gamma and Ps wk space gamma do not
have a direct relationshiop and certainly don't need to
be identical. What exactly is the relationship between
these 3 values? And why, with a 10bit LUT would working
space gamma changes introduce banding?
Thanks
amadou diallo
diallophotography.com
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