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pngalpha device does not work for multi-page pdfs

Posted: 2010-04-27T12:03:20-07:00
by Helen
Specific pdf and AI files render better when the sDevice is changed to pngalpha in delegates.xml. The problems is that this will only render the first page of a multi-page pdf file even when you specify the range using the [] notation after the input filename you only get one png file as the output. I am using version 6.5.9.3 of ImageMagick

Re: pngalpha device does not work for multi-page pdfs

Posted: 2010-04-27T19:32:00-07:00
by Drarakel
This is a known behaviour of Ghostscript. See here:
http://www.imagemagick.org/Usage/formats/#ps_reading
The 'ps:color' delegate is used rather than 'ps:alpha' by default because the 'pngalpha' ghostscript device only supports a one page/one image and PDF's generally are multi-page.