Problem generating PDFs from ID

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i generate pdfs digital book printing. excellent results color using standard pdf/x-1a: 2001 setting. however, grayscale images washed out, losing contract dialed in  in photoshop. way i've found maintain image quality turn off compression. however, produces huge files, difficult upload printers use.

 

the images tiffs , have been resized 300 dpi before being linked id file.

 

am missing something?

 

thanks suggestions.

 

fred

id doesn't have grayscale space way photoshop default 2 programs preview grayscale objects differently. in id when overprint or separation preview turned on grayscale previewed through document's cmyk profile. default photoshop uses 20% dot gain curve gray profile

 

lots of threads on see one:

 

http://forums.adobe.com/message/3484956#3484956#3484956

 

also check see if digital printer printing pdf's cmyk , gray values unchanged. many online printers force additional cmyk conversions when send x-1a files



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