Re: CMYK/RGB printing confusion - please help!
Re: CMYK/RGB printing confusion - please help!
- Subject: Re: CMYK/RGB printing confusion - please help!
- From: Uli Zappe <email@hidden>
- Date: Thu, 3 Mar 2005 01:27:48 +0100
Am 03.03.2005 um 01:03 schrieb Chris Murphy:
E.g. Make a screenshot of a typical blue Aqua button, save it as
TIFF, open the TIFF in ColorSync Utility and apply a Quartz filter
that converts the (RGB) TIFF to the Apple supplied Generic CMYK. If
you check the "Preview" checkbox, the shining Aqua blue becomes dull.
Quartz filters are broken in more ways than I care to count today. I
really don't have the inclination to find out whether there is yet
another bug that explains this behavior.
This was just an example. If I make the color space conversion in the
image app I use (TIFFany - since nobody knows it, I used the Quartz
filter example), the result is exactly the same, though no Quartz
filter is involved. If anything, it seems to be a problem with Apple's
Generic CMYK profile.
The reason I prefer the term editing space is because the reason we
have ProPhoto, Adobe RGB, ColorMatch RGB, etc. instead of Monitor RGB
is because it's the space we edit the image in before we output the
file.
But then back to my original question, in new terminology:
Doesn't it make sense to use Monitor RGB as editing space, if Mac OS X
converts anything into Monitor RGB before printing, anyway? One
conversion less ...
So, apart from the fact that *every* mode produces a blue that's more
or less too dark (and much too dark with every CMYK profile), the CLJ
5500 profile isn't as bad as I thought; maybe I can indeed get decent
color with a CMYK custom profile. Though I ask myself why each and
every CMYK profile (Apple's own Generic CMYK included) is so far off
with blue?!?
If you create blue in RGB, or an RGB variant, you will be disappointed
with the converted version more than 1/2 of the time. Blue is a very
difficult color to print unless you have blue ink in the printer (and
even then there is still plenty of room for improvement).
But "In Printer" mode shows that it can at least be printed a whole lot
better than all the CMYK profiles suggest ...
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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