Re: Preserving the black channel with a laser printer???
Re: Preserving the black channel with a laser printer???
- Subject: Re: Preserving the black channel with a laser printer???
- From: Henrik Holmegaard <email@hidden>
- Date: Sat, 20 Apr 2002 10:51:58 +0100
Mark Gallagher wrote:
to get good prints we have to apply a profile (obviously) but it
turns all K text and line art to 4C
This is actually how things are supposed to work, because K100% has
one Lab value in the printer profile you are converting and another
in the printer profile you are converting into. Therefore, K100% is
matched to composite CMYK black.
What you need is a switch that disables matching for objects defined
as black. ICC-enabled color space conversion workflows often have
this function, e.g. Helios OPI and GretagMacbeth iQueue.
The result of enabling such a switch is that the color of black is
not matched, and black is simply reproduced as pure ink tank device K.
How the application that is sending PostScript should define 'black'
in order for the color server or RIP to reproduce it as pure ink tank
device K is maybe not always clear.
Typically, if the application defines 'black' as R0 G0 B0 or K100%,
then in the first case the RGB channels are rotated to device K100%
and in the second case incoming device K100% is reproduced as
outgoing device K100%.
Hope this helps.
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