Re: sRGB or Adobe RGB?
Re: sRGB or Adobe RGB?
- Subject: Re: sRGB or Adobe RGB?
- From: "jc castronovo" <email@hidden>
- Date: Sat, 22 May 2004 18:40:09 -0400
----- Original Message -----
From: "Pete Carter"
>
So when I open an sRGB tagged file in PS and click don9t colour manage, PS
>
converts the embedded sRGB via its LAB engine to whatever is set in
working
>
space.
>
If I turn off colour management and do the same PS converts it to my
monitor
>
profile.
>
OK I checked this and if I set my working space to my monitor profile
theyre
>
now both the same. Good.
>
>
So if my PS working space is AdobeRGB and I bring in a camera sRGB image
and
>
view it under say preview or iPhoto the reason it looks lighter than in PS
>
is because PS is doing the AdobeRGB to monitor profile conversion when I
>
select don9t colour manage.
It sounds like you've got it Pete, but you've used the word convert, and I
just
wanted make sure that people understand that PS isn't automatically
converting to your monitor RGB space when you have color management turned
off. The original profiled numbers remain unchanged.
Try this:
Convert a small colorful file to WideGamutRGB and save it with that profile
embedded. Turn off color management and re-open it. When it sees the
embedded profile, PS will warn and ask if you want to convert to your
monitor space - don't. Tell it to discard the profile (don't color manage).
The image will look washed out. Now save it under a new name without the
profile embedded. When you re-open it, if any unintentional conversion had
taken place with CM off, the numbers would be different. In fact if you now
assign WideGamutRGB under mode, it will look like the original file again,
even though it was opened, saved and re-opened with CM turned off.
Fortunately, we know that this file was converted to look correct using
WideGamutRGB because we embedded that profile after we converted it and
saved it the first time. If we hadn't, we'd either have to guess or assume
that it was really supposed to look washed out.
Fortunately, with CM off, Photoshop makes you go out of your way to convert
a tagged file to your monitor space. Without tagged files and with CM off,
it's possible to do all kinds of unintentional damage to an RGB file.
john c.
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