Preserve Color Numbers - on a proof
Preserve Color Numbers - on a proof
- Subject: Preserve Color Numbers - on a proof
- From: Marco Ugolini <email@hidden>
- Date: Tue, 11 May 2004 21:56:20 -0700
On 5/6/04 5:42 PM, Thomas Holm wrote:
>
In Photoshop > View > Proof setup > Custom, you can select the Preserve
>
Color Numbers, which will show you how your CMYK document (whether or not a
>
profile is assigned) will print on a certain other device that has been
>
characterised by a profile. It may not be prefect but it's pretty close.
Thom,
That is actually not at all correct. To quote straight from the Help file in
Photoshop:
"If the proof profile you chose uses the same color mode as the document, do
one of the following:
Select Preserve Color Numbers to simulate how the document will appear
without converting colors from the document space to the proof profile
space. [...]"
Or, as Andrew Rodney explains ("Soft Proofing in Photoshop,"
http://digitaldog.imagingrevue.com/files/Soft Proofing in Photoshop.pd
f):
"[...] What this check box ["Preserve Color Numbers"] does is show the user
what the image would look like printed without first using the output
profile selected in the 3Proof Setup2. [...] If I simply send the file to
the printer, this is how awful it will print. With the check box off, I'm
seeing how the file would look if I first converted from Adobe RGB 1998 to
the [...] printer profile. [...]"
So, to recap, checking the "Preserve Color Numbers" box does exactly the
OPPOSITE of what you are stating, that is, it shows what the output will
look like if you send the numbers of the source profile straight to the
printing device WITHOUT first converting them to their visual equivalents in
the printer's color profile (which conversion is the whole point of proofing
to match the file's appearance on a correctly profiled monitor). It's a
warning and a reminder, if you wish, or perhaps just a geek treat.
At any rate, as you can see, it's not a trivial difference, and I hope it
clarifies the task for you.
In closing, as Andrew points out in his paper, "Preserve Color Numbers" can
be checked only if BOTH the source and destination profiles are in the same
color mode (both RGB or both CMYK). If not, it is dimmed and unselectable.
Best wishes.
--------------
Marco Ugolini
Mill Valley, CA
_______________________________________________
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.