Re: dangerous automatic ICC profile conversion É ;-(
Re: dangerous automatic ICC profile conversion É ;-(
- Subject: Re: dangerous automatic ICC profile conversion É ;-(
- From: "Anna Kobylinska,Filipe Martins" <email@hidden>
- Date: Tue, 7 May 2002 03:11:16 -0700 (PDT)
Somehow the OS has changedI
In Mac OS X 10.1.3, if you aquired pictures from your digital camera, they had no ColorSync
profile ("UNTAGGED RGB"). Now, in 10.1.4, all pictures get an sRGB profile, no matter what your
prefs are.
So the desktop uses "sRGB" and iPhoto uses "sRGB". Even worse, Photoshop 7 wants to use sRGB and
depending on your configuration, it may automatically do a rather disastrous conversion:
P it opens the picture with an embedded sRGB profile (instead of the profile of your input device)
and converts it to your working space, e.g. Adobe RGB 1998, with the result that your picture is
oversaturated and possibly gets a color cast, the color space is shrunk.
The first thing you may want to do is move the picture to the trash. Then you realise that all
your pictures P which didn't have an embedded profile yet and previously looked fine P are
affected. Even all your backups on DVDs, which of couse doesn't make much sense unless the Finder
"lies". The pictures in fact do not have any embedded profile. You can verify this using the
script "Show profile info". Yet, Photoshop 7 is convinced to have found an sRGBI
The workaround: always chose "discard embedded profile" when opening your
pictures in Photoshop 7. To improve your odds of avoiding disastrous automatic conversions, be
careful with scripts. In "Photoshop"->"Color Settings" do NOT use the setting "Convert to working
RGB" and DO activate "ask when opening" and "ask when
pasting".
There is, in fact, a way to change the default profile for a specific type of device using the
"Color Sync Utility". Yet, the result is always the same no matter how perfect your configuration.
Any picture transferred from the camera should have either "UNTAGGED RGB" or it should have the
profile the user defined in the ColorSync configuration as the default profile for the input
device (in my case it is "NIF RGB" instead of "sRGB"). This makes a huge difference.
I hope the workaround saves you valuable time and your unique photography.
Filipe Pereira Martins & Anna Kobylinska
Yahoo! Health - your guide to health and wellness
http://health.yahoo.com
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