Re: Legacy Gamma 1,8 in Mac apps
Re: Legacy Gamma 1,8 in Mac apps
- Subject: Re: Legacy Gamma 1,8 in Mac apps
- From: Koch Karl <email@hidden>
- Date: Tue, 22 Apr 2008 22:54:14 +0200
Hi Ray,
I admit my wording wasn´t perfectly scientific ;-)
If you perform the little test I mentioned, you will see for yourself
– best to be seen in the shadows because that´s where sRGB differs
most from gamma 2.2. If you don´t have one, I can send you a
"simplified sRGB" that has a real gamma 2.2 for comparison. Or you can
make one yourself with SpaceLab (download from www.basiccolor.de).
Best regards,
Karl
Am 22.04.2008 um 19:52 schrieb Ray Maxwell:
Hi Karl,
I am not sure what "not even close" means. It probably means
something like a "match" with no tolerance specified in any kind of
units.
I always refer to Bruce Lindbloom's site on the subject:
http://www.brucelindbloom.com/
Click on "Info" and then "Information About RGB Working Spaces". At
the bottom of the page is a full discussion on sRGB. You will
notice in his table that he says the gamma is approximately gamma 2.2.
Ray
Koch Karl wrote:
I fully agree with the suggestion to make the system tonal response
curve selectable. At the same time Apple could reestablish the
option to select a system CMM like in OS X 10.3 – this could go
into the same preferences panel. Since not every application allows
for selecting a CMM (e.g. Quark) this would make Macs much more
usable in their target market "graphic arts".
One more thing on gammas: sRGB is NOT gamma 2.2, not even close!
You can easily see that when you assign sRGB to an image and the
change to a simplified sRGB like the one Photoshop (before 7)
created when saving the sRGB profile to file.
Best regards,
Karl Koch
basICColor GmbH
Am 22.04.2008 um 13:14 schrieb Roger Breton:
Jan-Peter,
I agree with you 100%: they owe it to their users to abandon 1.8.
Roger Breton
It is the choice of Apple to serve the professional imaging
community
and also the digital imaging prosumers by implementing
international
standard for digital imaging correctly or to mess up their
customers by
forcing them to a legacy Gamma of 1,8
Regards
Jan-Peter
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