Re: dot gain and generic CMYK profiles
Re: dot gain and generic CMYK profiles
- Subject: Re: dot gain and generic CMYK profiles
- From: neil snape <email@hidden>
- Date: Tue, 08 Oct 2002 20:03:18 +0200
on 08/10/2002 18:53, Maarten van der Spek at email@hidden wrote:
>
From Linocolor support I'll get information about the 'Offset-Euro-postive
>
plates' profiles. All these profiles are for coated paper and the dot gain
>
compensation is 18% (their no profiles for uncoated paper included by
>
Linocolor Elite).
The profiles for GCR300 K85 would be acceptable for sheetfed pos non glossy
papers. IF it was too heavy there would still be room to cut back on the
press, yet the images separated from three color to this profile will print
correctly (except of course on high ratio recycle wood papers!).
The supplied Linocolor profiles are usable in most cases where a default sep
is needed, and you will only be able to out guess the worst scenario.
Playing with profiles in Linocolor or Photoshop will give you readouts in
the sample points the advantage goes to Photoshop as it's control over
rendering, Adobe CMM+ACE. Yet if you are feeding batch scans to a server
then you'll be running the separations through Linocolor.
>
Adobe's support tells me that the dot gain compensation in the Euroscale
>
Coated 2 profile is 9% and in the Euroscale Uncoated 2 profile is 15% (the
>
same values as standard shown in the Custom CMYK dialog box from Photoshop).
These are the numbers if you used a custom set ink set up. The profiles that
Mr. Knoll made take care of dot gain for each channel from specific measured
data sets. They are of a very good quality, the results are what one could
expect of high quality seps, hands down.
The other numbers when using custom set ups are confusing. Bruce explains
why in his book if I remember correctly.
>
In the book 'Real World Photoshop 6' from david Blatner and Bruce Fraser I
>
read that the dot gain for Euroscale Coated is about 19% an for Euroscale
>
Uncoated is about 25% (table 5.1) and that the guideline for positive plates
>
is 10-12% (table 5.2).
This is around average. The numbers go way down on CTP though. This is still
the big question for service bureaux , if they compensate with profiles
before the CTP plate setter or just run reverse transfer curves in the plate
setter.
Neil Snape email@hidden
http://mapage.noos.fr/nsnape
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.