As I typically print with a photo lab using RGB or sRGB, I have never run into this issue.
The CS6 workflow I use is Adobe RGB 98. i shoot raw in that format as well as edit and save as for print in that color space. The problem I'm having is the printer I'm using for this project is a Konica Minolta 5500. I've created a book with psd images placed into ID and then exported to pdf.
I tried using the same color profile ensuring the transparancey blend space was RGB and the export to pdf print was adobe rgb. The first round of the books were satisfactory despite the color shifts but the problems surfaced on the second run. After exhausting multiple combinations of CMYK and sRGB, I was advised to convert the photographs to Grayscale and assign a color profile of sGray and then export to PDF using the sGray profile.
So, I did that but, when I preview with overprint in ID with an sGray for Proof Colors, every image is brightened to a point that is not acceptable. I can't adjust the color space to sGray and can't preview the Overprint in Photoshop so I'm not sure how to compensate. As you might have guessed, this is not an area I have deep experience with and while I've looked through the treads on sGray, I'm not understanding how to compensate.
So, I would be very grateful for any feedback here and recommendations on workflow. The goal is a printed book that will be for sale with the individual images offered as an edition of prints. So it's somewhat critical for the photographs in the book to be on par with the digital inkjet prints with awareness that the prints will be superior in terms of tones and quality.
Appreciate any feedback offered in a way an inexperienced with color printing user can understand. THANKS!
I should have added this - when I view in Proof Colors, the images look fine; when I also select Overprint, the images are very very bright. I've asked the printer for an ICC profile and they don't have one. They are simply choosing sGray to print the pdf file I've given them. I've never had overprint brighten an image the way it is which is what I'm confused about. As for using a CMYK profile - the printer can adjust the colors so they haven't given me anything to base things on. And to be honest, I wouldn't know what to do with them. If I could print this economically using my regular lab printers I would; unfortunately, this is the only option I can use.
InDesign doesn't have a grayscale space, so when you place a grayscale image it displays differently with Overprint/Separation preview turned on or off. With it off you get a 2.2 Gamma (sGray) preview, with it on the preview is via the document's CMYK profile--the preview will change if you assign a different CMYK profile. In both cases the grayscale values remain unchanged.
So if you edit in sGray in Photoshop and export from ID with sGray as the destination color (use PDF/x-4), your PDF images should preview unchanged in Acrobat.
THANK you. That is what i was hoping for. One question though - if i preview in acrobat with dot gain 30% it's perfect; with sGray, it's still too washed out and bright. Would exporting to dot gain 30% be as acceptable as sGray? And as i would like to understand all of this better, can you suggest any books on the subject that explain this all in terms that are easy to understand?
Sorry my first post wasn't right. If you convert to grayscale on export the conversion will be from your CMYK space to sGray. Your places grayscales will be treated as if they were in the CMYK black channel.
Because ID doesn't have a grayscale space it's not possible to have a grayscale profile (sGray) as the source when you convert to grayscale on export.
The typical workflow for gray scales going to an offset press would be to use the press profile as the assigned grayscale profile when you edit in Photoshop--sGray isn't a press profile. In this case you are sending the same layout to two different devices, so you might be better off converting your grayscales to sRGB in photoshop and place RGB. Export PDF/x-4 and let the prints handle the conversions.
that worked! i assigned an sRGB profile to the b/w photos in photoshop and brought them into an ID file created with an RGB profile; explorted to PDF/x-4 no color conversion; printer used sGray profile. it's not an offset printer but a digital copy printer. it's right on. so THANK you again!