Re: About InDesign's "Save as PDF" color management settings
Re: About InDesign's "Save as PDF" color management settings
- Subject: Re: About InDesign's "Save as PDF" color management settings
- From: Marco Ugolini <email@hidden>
- Date: Tue, 27 Jan 2009 19:04:55 -0800
- Thread-topic: About InDesign's "Save as PDF" color management settings
In a message dated 1/27/09 5:01 PM, Rick Gordon wrote:
> I take your point concerning the wording the Convert to Destination (Preserve
> Numbers). But it's tricky, because the idea is that all non-CMYK is converted
> to the destination profile, while all CMYK is assigned the destination profile
> without conversion. So what WOULD be the clear wording in three or four words?
Hi Rick.
OK -- this is what that specific entry in the help file has to say:
*****
Include Destination Profile
Assigns the destination profile to all objects. If Convert To Destination
(Preserve Color Numbers) is selected, untagged objects in the same color
space are assigned the destination profile so that color numbers don¹t
change.
*****
I read that as meaning that if, as a part of producing your PDF, you choose
to convert to a chosen destination profile (RGB or CMYK), objects (RGB or
CMYK) that have no embedded profile and are "in the same color space" (as
what?) will not undergo a conversion, and are instead assigned the chosen
destination profile. (Incidentally, I think that this behavior extends to
*all* objects in the file, not just CMYK elements, as you seem to think.)
In which case, a few points:
1) Why don't they write more clearly and less ambiguously?
2) They mention "untagged objects in the same color space". What they really
mean is untagged objects in the same color *mode*, besides failing to
specify: "the same color mode as the chosen destination profile". Throughout
the Adobe Creative Suite, "color space" routinely refers to a chosen ICC
profile (be it CMYK or RGB), whereas color *mode* is the term to indicate
whether a file is in RGB or CMYK or Grayscale, or Lab, or what have you,
independently of the specific ICC profile assigned to it -- as exemplified
by Photoshop's Image > Mode menu item.
3) All tagged objects are converted to the destination profile, and that
much seems clear. But nothing is being said about how untagged RGB objects
are processed when the file is converted to CMYK, or untagged CMYK objects
when the file is converted to RGB: since any conversion must include a
*source* profile as well, what source profile does the application assume
for objects that are untagged?
4) Shouldn't the user be reminded that the destination profile may end up
not being appropriate for the images to which it becomes assigned?
5) What does it mean to word a menu option as "Convert To Destination
(Preserve Color Numbers)"? Isn't it a bit like directions that instruct you
to "Dip Into Water (Keep Dry)"...? It's either one or the other. Doesn't
seem helpful.
Marco Ugolini
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