[xep-support] Transparency issue

From: Jorge Bernad <Jorge.Bernad@incony.de>
Date: Wed Dec 02 2009 - 01:28:52 PST


we have to embed grayscale images with transparent background within a
PDF/X-3 file generated by XEP 4.12. Since XEP only supports transparency
in PDF for PNG or GIF images and GIF is not an alternative for us (due
to loss of quality) we decided to use PNG. The PNG images are being
generated by ImageMagick and should conform to the XEP requirements for
transparent PNG images:

"Single-color transparency is supported in PDF output only. For
indexed-color images with alpha, the first completely transparent color
in the palette is used."

The PNG images use an alpha channel but the transparent color is "white"
which is the first color at the image color palette. The generated
images are handled as transparent by Photoshop.

Unfortunately XEP is drawing the PNG image background as white instead
of transparent.

What can we do?

Mit freundlichen Grüßen / Kind regards
Jorge Bernad Pelegrín
Jorge Bernad Pelegrín, INCONY AG, Technologiepark 34, D-33100
Register Paderborn HRB 3694
Vorstand: Dr. E. Radeke, H. Aisch, J. Bernad 
Tel.: 05251 877 3925, Fax: 05251 877 3911,
http://www.incony.de, mailto:Jorge.Bernad@incony.de
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Received on Wed Dec 2 01:48:13 2009

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