RGB vs. CMYK - output profile Q (bug?)

[chris denesha]

At 11:15 AM 11/9/2006 -0500, you wrote:
>Given: C7.0.5 on OS 9.2.2, with preference Graphics -> 'Convert RGB to CMYK when generating Postscript or PDF' UNchecked.  Document Settings -> Color Matching is on.
>
>I have a TIF headshot of a person that is RGB, without an embedded profile.
>
>What do you think will happen when the ad is printed from Creator to Process separations?  (I'm printing to a File with format 'Postscript Job' so I can quickly distill to PDF to see the seps).  Will the RGB headshot be separated to CMY, or just be on K?  From my testing, I get a headshot that is separating to CMYK, no matter what the Output profile is (None, CMYK Default, or Day CMYK).
>
>How about when saving as an EPS and printing to separations from Quark, which is our Production workflow?  If the Output Profile is None, then the RGB image is just on the black plate, with no CMY plates having information.  If the Output Profile is CMYK Default or Day CMYK (our custom profile) then the RGB image is separated.
>
>For both printing and saving as EPS, I tried both Level 1 and Level 2 postscript.
>
>
>How exactly is it supposed to work, considering the 'convert RGB to CMYK' option is unchecked?
>
>thanks,
>
>chris


Ok, after further testing, here are my conclusions, for when 'Convert RGB to CMYK when generating Postscript or PDF' is UNchecked:

1) When printing from C7 and choosing Process separations, C7 assumes you want RGB converted to CMYK, and will do so.

2) When Exporting an EPS from C7, when your document's Output Profile is CMYK, C7 assumes you want RGB converted to CMYK, and will do so.

3) When Exporting an EPS from C7, when your document's Output Profile is None, C7 will look to the 'Convert RGB to CMYK when generating Postscript or PDF' option to determine whether or not to retain the RGB info in the EPS.

I am going to submit a feature request so that a TIP can be written into the C8 User Guide for this Preference (which seems to be new since it isn't in my C7 User Guide :).

thank you for listening,

chris