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Old 11-12-2007, 01:44 PM   #1
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cups, pdf and opacity problems

Hi all,

I have a pdf with a semi-opaque watermark. In evince the object is fully opaque. In kpdf the object views semi-transparent but prints fully opaque. In Adobe Reader it prints and views correctly semi-transparent. Printing directly from the command line it prints fully opaque. I think (in my ignorance) it has to do with PostScript Levels ???The problem with Adobe Reader is that I can't print multiple copies!!!.

So, I'd really like to understand what's wrong, but most importantly I'd like to have a cli option to print multiple copies of a bunch of pdfs.

Thanks for any ideas,

Old 11-12-2007, 09:01 PM   #2
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It seems that only Adobe's pdf-ps filter handles the transparency correctly. Has anyone else had this problem?

Anyway, if anyone else wants to go the command line way, what worked for me was "acroread -toPostScript -landscape *.pdf ps_dir/" which creates PostScript files which I can print with lp, so I can easily automate what I'm doing.

I'd still like to understand why evince and kpdf fail.

Old 10-01-2015, 11:52 AM   #3
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Registered: Jul 2014
Distribution: CentOS Linux release 7.4.1708 (Core)
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Smile Opaque images - RGB -> RGBA


I've seen a similar problem with cups-pdf. A three channel RGB image prints opaque when I print it as PDF. I've had luck converting the three channel RGB to four channel RGBA. The fourth, "alpha" channel is used for opacity.

I use gimp to add an alpha channel to the RGB image. After I add the alpha channel, I save the image as .png or whatever. Subsequently, I use the image in a document and print it with cups-pdf and everything looks fine.



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