PDF image changes when opening in photoshop

M
Posted By
m3printing
Jan 10, 2009
Views
370
Replies
2
Status
Closed
sometimes when we open PDF files in photoshop the image changes. sometimes text disappears and other times fading occurs. Here is how it can be duplicated:

1. First try downloading the file here <http://www.m3printing.com/files/wierd.pdf>
2. open the file with acrobat. take note of the red NYN in the upper left
3. open the file with photoshop. you will notice the YN becomes faded

any clues as to why this is happening would be greatly appreciated

ps. we use photoshop CS2

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GH
Gernot_Hoffmann
Jan 10, 2009
This doc is unnecessarily complex in its color structure. It uses CMYK and seven spot colors. CMYK is DeviceCMYK,
which means, the space is not defined in the doc by an ICC profile.
A part of the red text vanishes if the doc is opened in
Photoshop in CMYK mode. I don’t know why. Perhaps a trans- parency flattening problem.
Analyzed by Acrobat > Tools > Print Production > Preflight.

My suggestion: convert each page into a well specified CMYK space as recommended by the printer.
The fastest solution:
Open in PhS in Lab mode with reasonably high resolution, for instance 288ppi, convert into a specified CMYK space and save as TIFF.
The correct solution:
Go back to the source program (InDesign) and replace all Spots by process colors. Flatten and save by new name.
Export as PDF.
Flattening in advance to Export guarantees the appearance. Export with layers contains the risk that flattening at
the receiver is wrong.

Best regards –Gernot Hoffmann
M
m3printing
Jan 10, 2009
thanks for the help…we have been baffled over this one for a very long time!

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