Re: Grayscale profile for offset printing
Re: Grayscale profile for offset printing
- Subject: Re: Grayscale profile for offset printing
- From: Klaus Karcher <email@hidden>
- Date: Thu, 16 Aug 2007 13:37:34 +0200
Bob Gardner wrote:
Does anyone know where I can get a decent grayscale profile that I can
utilize in EFI for offset printing on coated and uncoated stock?
The short answer: there is none.
If you want your proof to show what's happening in print, avoid proofing
grayscale data. Instead of treat them as K-only CMYK (e.g. place your
grayscale images in InDesign, generate a CMYK-PDF, (use the Acrobat
preflight to verify that it has really only one channel) and use the
appropriate CMYK profile as output intent. Everything else causes
problems here or there.
You can use Photoshop to create your onw grayscale profiles, e.g. you
can load a CMYK-Profile as grayscale working space and save it as
Grayscale-ICC-profile (sorry, I'm using the German version of Photoshop,
maybe the translations are wrong). The whitepoint of this profile will
match the *lightness* of your paper and black ink - but not the *color*.
Its TRC has an offset at the low end (to reflect the lightness of
black). This offset causes clipping if the profile is used without BPC
-- that's not intended by the ICC spec IMO.
If you create your "own TRC" in Photoshop with e.g the values from the
ISO 12647-2 curve "60B" and save it as ICC-Profile, there is no offset
(and therefore no clipping), but the Profile treats white as Y=100 and
black as Y=0.
Even if you edit the white point of this profile to match your paper
color, the black is still wrong.
Regards,
Klaus Karcher
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden