Re: linocolor and printopen rendering problems
Re: linocolor and printopen rendering problems
- Subject: Re: linocolor and printopen rendering problems
- From: neil snape <email@hidden>
- Date: Sat, 07 Jul 2001 08:24:39 +0200
on 6/07/01 23:09, email@hidden at email@hidden wrote:
>
has anyone, using linocolor for scanning, noticed the problem with linocolor
>
readings in RGB?
Yes , avoid multiple openings into Linocolor as there are inevitable
rounding areas when passing into Lab. These are reflected in the rgb values.
>
We're having another problem in Printopen 4.0. When we convert a file from
>
RGB to CMYK in Printopen, and use relative colormetric rendering, the colors
>
are not optimized but the picture remains pretty much the same density. If we
>
convert using perceptual rendering, which is what we do use, the color change
>
is perfect but the picture lightens noticeably. Can anyone explain this?
When you build the profile in PO the relative table should keep the maximum
densities stipulated (GCR+K). The perceptual is *
>
Perceptual rendering says "preserve the perceptual relationships
>
*between* the colors (as much as possible), even at the expense of
>
colorimetry." best said by Fred Bunting.
If there is a big difference this isn't normal.
Before PO 4 and 3.01 the relative table always held to the maximum density
of the inks regardless of the TAC/GCR settings chosen when building the
profile. See Henrik's iccabc.com on this.
Neil Snape email@hidden
http://mapage.noos.fr/nsnape