Re: use of sRGB as a default
Re: use of sRGB as a default
- Subject: Re: use of sRGB as a default
- From: Rick Gordon <email@hidden>
- Date: Sun, 20 Jun 2004 23:41:12 -0700
First, be aware that you may find Generic RGB located in /Library/ColorSync/Profiles as well as /System/ColorSync/Profiles.
Secondly, be aware that you may find that changing Generic RGB to a fake-named version may change your printed output in a much wider context than you wish. Since sRGB and Generic RGB are somewhat similar, you may not notice the difference, but if you should experiment by deleting the real Generic RGB and replacing it with, for instance, a copy of Wide Gamut RGB, renamed internally and externally to Generic RGB, you may find that all your prints, tagged and untagged, have shifted in the direction of serious desaturation. Try it before you buy this solution.
You could delete the real Generic RGB using the terminal command...
sudo rm /System/ColorSync/Profiles/Generic\ RGB
(You'll need to input a password.) ...but I'd keep it around because you will likely find that this solution has unintended consequences.
You could move it to the Desktop with the command...
sudo mv /System/ColorSync/Profiles/Generic\ RGB ~/Desktop
...or just select it, go into Get Info and change the owner to yourself, instead of root. (You'll need to input a password.)
For a thread dealing with this, see a thread titled "Epson No Color Adjustment Experiment" between 12/20/03/ and 12/24/03. My opening post is quoted below:
At 4:05 PM -0800 12/20/03, Rick Gordon wrote:
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I've demonstrated to myself the Generic RGB profile is definitely a factor when printing through the Epson Driver in Jaguar. I ran side-by-side prints using Photoshop color management for printing, setting my custom printer/paper profile and choosing No Color Adjustment. One print was printed as with the usual Generic RGB.icc in /System/Library/Color/Sync/Profiles; the other was printed after I swapped in and renamed Wide Gamut RGB to Generic RGB.icc.
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The print printed while the false copy of Generic RGB was installed was dramatically reduced in saturation.
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So this leads me to several questions:
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1) If the output were assigned to the false, higher-gamut version of Generic RGB somewhere in the workflow (as was the case in the second print), why would the results show less, rather than more saturation?
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2) What is the real impact of this for printing testcharts and creating printer profiles? If the testcharts are printed after interacting with Generic RGB, and the results are subsequently profiled, would the resulting profile data be substantially different, or would it be essentially the same, since in either case the workflow is consistent. Which I guess really means: In what way does the definition of Generic RGB impact the gamut, tonal range, and linearity of the testchart (or any other print)?
Rick Gordon
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On 6/21/04 at 3:17 PM +0930, Peter Fakler wrote in a message entitled
"Re: use of sRGB as a default":
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When I try to trash the Generic RGB Profile from the ColorSync folder in the OS X (10.1.4) system folder (in order to rename the sRGB profile as Generic RGB Profile), a window pops up saying "The operation could not be completed because this item is owned by root."
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What to do?
--
___________________________________________________
RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
___________________________________________________
WWW:
http://www.shelterpub.com
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