CMYK/RGB printing confusion - please help!
CMYK/RGB printing confusion - please help!
- Subject: CMYK/RGB printing confusion - please help!
- From: Uli Zappe <email@hidden>
- Date: Wed, 2 Mar 2005 16:38:36 +0100
Hi everyone,
I had asked in
http://lists.apple.com/archives/colorsync-users/2005/Feb/msg00265.html
how you change the default color space (CMYK <> RGB) for a PostScript
laser printer (a HP Color LaserJet 5500 in my case) in ColorSync
Utility. Unfortunately, nobody seemed to have an answer.
The reason may well be that evidently this cannot be done. This is what
HP support tells me, and in fact, in the respective PPD there's an
entry to specify CMYK as the default color space, suggesting this
setting is indeed fixed.
But then, how do you manage to print something and use the RGB ICC
profile instead of the CMYK ICC profile of the printer? This must be
possible, or else it would make no sense for a PPD like the one of the
CLJ 5500 to provide an RGB ICC profile as well.
HP support says that I have to switch the color space I want to print
with in the app I want to print from. However, I have no idea how to do
this e.g. in TextEdit (just to use a simple example that everyone
knows). I have experimented with Quartz filters in the Print panel, but
to no avail.
To make things even more confusing, Preview's info panel provides no
information whether a PDF contains an ICC profile (it does with TIFFs
etc.), so I have no way to control in a print preview what kind of
color space the PDF is using. Or do I get this wrong and the PDFs Mac
OS X creates for printing do not contain an ICC profile? - But then,
how could it possibly tell ColorSync to print with the RGB printer
profile instead of the (default) CMYK printer profile?
As you can see, I'm utterly confused, and I can't find any
documentation anywhere that's relevant for this problem. (Maybe this is
because several parties - Apple and the printer manufacturer and maybe
even an application software vendor - are involved.) So every hint how
to proceed with this problem would be greatly appreciated, because I
don't know what to look for, and am really lost :-/
The reason, BTW, I would like to have the option to use the RGB profile
for printing is that the CLJ 5500 prints far too dark colors in CMYK
mode. (I have no idea if this is a general CMYK problem, or a problem
specific to the CLJ 5500). If I switch off ColorSync completely in the
Print Panel (ColorSync > Color Conversion: In Printer), the colors are
much better (reportedly, in this mode the CLJ 5500 uses an RGB profile
internally). But with this setting, I loose the option of fine-tuning
color by creating and applying a custom profile; so I want to stick
with ColorSync.
Thanks in advance for any replies!
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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