Re: Questions about printers and proof accuracy
Re: Questions about printers and proof accuracy
- Subject: Re: Questions about printers and proof accuracy
- From: Henrik Holmegaard <email@hidden>
- Date: Fri, 30 Nov 2001 00:33:42 +0100
I use Adobe Photoshop 6.01 and have set my color settings to
use a colorsync workflow with RGB using the monitor profile created by
the spectrocam and the CMYK profile is set to use the profile created
with colorblind.
a. don't target your CMYK colors for a laser printer, target your
colors for glossy offset which has a larger gamut. There are a couple
of dusty ProfileMaker profiles for ISO 12647 international standard
offset on www.eci.org. They should have been updated a long time ago,
come to think of it.
b. don't target your CMYK colors for your monitor profile, it is a
non-linear RGB space and it is way way too small for offset
production. Target your colors for eciRGB10 which includes all colors
possible in the largest international standards offset space, or
target your colors for Adobe RGB (1998). Both are well-behaved spaces
in 8 bit workflows.
The Ole No Moire photo has four columns for CMYK which run from a 10%
patch all the way up to a solid 100% patch for each color. On both
printers I have noticed that the Cyan and Magenta values are much darker
than the process Cyan and Magenta swatches on the Pantone color swatch
book.
This is no good as there are no colorimetrically defined target
values for the picture. Don't visually tweak your printer which has
totally different colors for cyan, magenta, yellow and black compared
to offset. Set your printer up with the largest color space it will
support, profile that color space, make a 16 bit profile for your
printer and leave the rest to the ICC conversion framework.
They still print out darker than CMYK
pantone swatches.
For nice nice PMS matching hang on a little longer for ProfileMaker 4.
Is it just not possible to use color laser printers
to get a ball park idea of what the final output should look like? Do I
need a printer such as the HP 10 or 20 PS to get decent results?
Color lasers have a gamut which is too small to simulate offset what
with their medias and colorants. You need a 10ps or 20ps which offer
bigger and more stable gamuts.
Try the 'Standards-based inkjet proofing ABC' in the list archives
for a little more information about press to proof accuracy.
Hope this helps.