Re: Photoshop 6 changing Illustrator colors
Re: Photoshop 6 changing Illustrator colors
- Subject: Re: Photoshop 6 changing Illustrator colors
- From: Mark Burgess <email@hidden>
- Date: Thu, 11 Apr 2002 17:46:06 -0700
At 3:47 PM -0600 4/11/02, Chris Murphy wrote:
Mark Burgess <email@hidden> writes:
>You'd think so, but if I have PS6 set to SWOPv2, Photoshop
>re-interprets 100%K from Illustrator (8) as a gray.
Well I just tried it with Illustrator 10, taking a CMYK test TIFF and
placing it into a CMYK illustrator document, and making a few C, M, Y and
K shapes with 100% each respectively. I saved it both as illustrator 10
EPS and Illustrator 8 EPS, and brought it into Photoshop 6 as a CMYK
image in the Rasterize Generic EPS dialog box - and I end up with exactly
the same values as I put into the document.
Actually I already know why the black was changing -- because it was
defined as cmyk and was being rasterized to RGB. Nobody really
understands why, but it's something we discovered by trial and error
a while back. During troubleshooting I may have gotten mixed up and
thought that it was also changing when going to CMYK but I can't
reproduce that now.
Note that Illustrator 10 does not have the problem unless it is set
to the "Emulate Illustrator 6" color settings and the eps is saved in
Illustrator 8 format.
Regardless, I can tell you that 100%K only is lighter than rich black
when it comes to SWOP.
The main trouble I was in the past with black is when converting from
cmyk to grayscale within Photoshop -- the image does not appear to
change on-screen (if I desaturate before converting) but it prints
differently. The only way to keep it from printing differently is to
switch to something other than SWOPv2. Which is fine, btw. The
designers don't like to see black represented by gray onscreen
anyway. It confuses them.
>Ahh, but Photoshop is in RGB mode, not CMYK. So I'd expect the RGB
>color to stay as-is. So far I've had absolutely no luck in
>rasterizing Illustrator 8 RGB in Photoshop 6. I have tried the demo
>version of Illustrator 10, and with the out-of-the-box settings it
>has the same problem. If I switch both it and Photoshop the Web
>Defaults settings the colors don't change. I guess we now have a
>reason to upgrade. :-|
Wait a minute. These are RGB EPS files from Illustrator?
Well, in Illustrator 8 you can have an eps with both RGB and CMYK.
The troublesome file had a color defined as RGB. Black happened to be
defined as cmyk, but changing that to rgb black did not change how
PS6 interpreted the color. So, yes.
I'm confused. If
you create a CMYK document in Illustrator and make a shape with 100%
black,and rasterize it in Photoshop as CMYK, you will get the same CMYK
values. If you are incorporating RGB anything into this, THAT is probably
part of the problem.
I'm just trying to rasterize a logo that was set up with web-safe
(i.e. rgb) colors in Illustrator. When Photoshop 6 rasterizes it, the
rgb numbers are way different. As far as I can remember PS5 did not
give us this kind of trouble. If I mess with the color settings in
PS6, the numbers change but no setting results in the correct numbers.
If 100%K SWOP is being converted into RGB, and then is being converted
back into CMYK (through the info palette or an actual conversion on
open), then that's why you aren't getting 100%K only when opening the
document in Photoshop.
A #009966 (r0g153b102) vector shape is being converted to rgb pixels.
There is no mode change.
If I have PS6 set to US Prepress defaults, the color becomes
r77g167b135. If I have it set to Web Graphics Defaults, the color
becomes r0g169b134. Unfortunately I don't know color management well
enough to understand the significance of that.
Thanks,
--
Mark
_______________________________________________
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.