I mocked up an ad in Photoshop at 600DPI and now I'm told:



Anyone know how I do that? I've set the image mode to CMYK. I see the CMYK channels and it all looks good. But when I print to PDF I can't tell if it's CMYK or if it's still at 600DPI or if it got lowered for some reason.

I crawled through the file info and metadata but I don't see anything telling me that I did it correctly.

Oh, I also tried "File" > "Save As" and specifying PDF as the file type. Looks as if it stayed as 600DPI.

But is it CMYK?

PDF's info:

hmmm if it is saved in cmyk why would it not be?

Hi

Save the pdf. then open the pdf in CS3 and a box will pop-up Impot pdf and it will give you details, e.g. image size, resolution and mode.

Didn't get the dialog but when I opened the PDF in Photoshop and checked the Image Mode it does say CMYK.

Thanks for the tip! (Can't believe I didn't think of that but it answered my question).

Do you 'Print to Acrobat' or 'Save as PDF'?
In any case - check the presets you use as they are typically set to compress and downsample color images to 300 dpi. The 600 dpi is an overkill for CMYK images, but, if you really want, you can turn off the downsampling and select ZIP compression (lossless) instead of the default JPG compression.

Alternately you can save as TIFF and use "Create PDF from File" in Acrobat.

To check the end result, as you noticed you can't do much in Acrobat. You can open the PDF in Illustrator and poke around.