[cups.development] pdf with transparent image and cups raster filter

[Michael Sweet]

What OS/Linux distribution?

What version of CUPS?

On Jun 10, 2010, at 1:36 PM, Paul Newall wrote:

> I have a cups raster filter, using colorspace CUPS_CSPACE_K or CUPS_CSPACE_CMYK
> Some pdf files fail to print.  The common factor seems to be that they contain an image with some transparency.
> The filter is behaving as though the raster was blank (every byte of the data = 0). It's possible that there's some problem with the filter, but before I spend a lot of time looking at that...
> Are there any known problems with cups converting pdfs with transparency to raster format?
> Any ideas for how I should investigate this?
> Maybe the pdf files are not to specification in some way? Is there a pdf file validity check I can run? or are there sample "correct" pdf files somewhere I can download? Or sample postscript files with transparency that I can use to see if the problem applies only to pdfs?
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________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair