ann_shelbourne@adobeforums.com

I AM placing them in an AI CMYK do***ent.

Making PDFs from Illustrator seems to somewhat inconsistent.

Sometimes I get 4 plates in a composite Acrobat file, unless I select embedded PSD images and go to Filter/Color/Convert to CMYK.

Surely, if theses files are Photoshop GS files, they should pass through Illustrator to a PDF as Grayscales?

Other times, the SAME images, proof in Composite PDFs only as Rich Blacks (whether I use Color / Convert to GS or to CMYK in AI or not!) and the only way to see them as grayscales in Acrobat is to "Print" to a PDF choosing Separations.

ann_shelbourne@adobeforums.com

I am totally puzzled then!

My GS files started as RGB files. I have done the conversion in Photoshop CS two ways: Convert to Profile and also using the simple Mode Change.

Seems it might be time to trash all of my Color Settings Prefs.……

gary_newman@adobeforums.com

If my Illustrator do***ent, containing only a GS image, is in CMYK mode, the saved PDF file will have data in the K plate only, regardless of how that GS image was made.

If my Illustrator do***ent, containing only a GS image, is in RGB mode, the saved PDF file will separate with data in all 4 channels, regardless of how that GS image was made.

If the GS image is somehow converted to an RGB image, and placed or embedded in a CMYK Illustrator file, I’ll get data in all 4 channels, too.

That’s how it’s working for me.

wade_zimmerman@adobeforums.com

I'm with Gary it works for me as well. So did those files I had problems with that time and I am assuming that you are correct and they placed the pdf in Quark which is very confused.

Anyway the GS separates properly from AI.

dee holmes

Gary, I don't quite understand your 3rd statment,

If the GS image is somehow converted to an RGB image, and placed or embedded in a CMYK Illustrator file, I’ll get data in all 4 channels, too.

Can you explain more simply?

gary_newman@adobeforums.com

I wondered what would hapen if the Grayscale image were inadvertantly converted back to an RGB file, and placed in an Illustrator CMYK do***ent. So I tried it, and saved out as a PDF to test separations. Just as with the Grayscale image in the Illustrator RGB file, when it got to PDF, there was content in all four channels (CMYK). Which is what I would expect. Separations do not like RGB, no matter where they came from or how they got there.

dee holmes

Thanx.

gary_newman@adobeforums.com

And it’s not happening for me with AI CS.

ann_shelbourne@adobeforums.com

But can anyone explain why an RGB file which was converted to GS in Photoshop CS; and then Placed in an Illustrator CS CMYK do***ent (which was originally created as a new CMYK file) is showing data in all four channels when SavedAs a PDF?

This does not happen if you place the same image directly into InDesign CS and make the PDF from there.

wade_zimmerman@adobeforums.com

Nit for me as well!