Re: Photoshop 6 changing black to gray
Re: Photoshop 6 changing black to gray
- Subject: Re: Photoshop 6 changing black to gray
- From: Mark Burgess <email@hidden>
- Date: Fri, 22 Feb 2002 22:35:50 -0800
At 5:55 PM -0800 2/22/02, Thomas Knoll wrote:
The file is really a CMYK value. 100% K in CMYK is nowhere near as
dark as CMYK can get.
Well, no, I guess not -- but in this case it not only happens to be
the darkest thing on the page (it's plain old black type) but it also
needs to print the same when it's converted to grayscale (I do not
want the type to be screened).
I kind of see what Photoshop is doing -- it's showing 100%K on-screen
as a gray value, in order to allow rich blacks to show as being
darker than plain black. When the grayscale conversion happens the
on-screen appearance is maintained, *but* at the expense of the
printed appearance. That's messed up. Instead the black percentage
should be maintained, *as well as* the on-screen representation of
pure black. In other words, is there a setting for grayscale that
shows it the same on-screen as the black in a cmyk file? It would be
a smaller gamut on screen but at least it would allow the black plate
to translate straight across.
Seems to me that in the cmyk -> k translation, the k values should be
used as a sort of threshold -- colors + k can cause it to go darker,
but k alone should not be lightened. I can't imagine that someone
would really want their rich black to look darker than their black
type, when both are converted to grayscale. Maybe once in a while for
certain special effects but that's gotta be the exception.
A work around in your case is to rasterize into CMYK, and discard
the CMY channels, keeping only the K channel.
Yikes, it took a good 10 minutes just to rasterize the page into
grayscale (57mb)... I'll just switch to PS4 emulation instead -- much
quicker and allows colors to translate too.
Actually discarding the cmy channels isn't a necessary step. I've
found that just selecting the K channel and then converting makes the
cmy channels go away automatically (and the k values do not change).
--
Mark
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