[pstricks] Real transparency hack

Herbert Voss LaTeX at zedat.fu-berlin.de
Tue Jul 12 21:20:30 CEST 2005


Jan Steffan wrote:

> However, I found another hack, that allows the use of REAL transparency.
> Although postscript does not support transparency, newer versions of 
> ghostscript do:
> http://www.cs.wisc.edu/~ghost/doc/AFPL/8.50/Language.htm#Transparency
> 
> When a file using these features is run through ps2pdf14 (not ps2pdf) it 
> produces a nice PDF with real transparency effects.(In order to view or print 
> it a PDF viewer is required that supports PDF version 1.4. Acrobat 5.0 and 
> above and newer versions of ghostscript will do.
> 
> I hacked together a proof of concept based on pstricks that defines a new
> fillstyle "transp" as this was the easiest the solution I could quickly find.
> A real solution should provide transparency independently of filling.
> 
> I probably also did not consider all sideeffects and problems this hack may 
> cause and I surely didn't fully comprehend the PDF transparency mode, which 
> is quite complicated. 

looks good, I'll put this stuff into pstricks-add

Herbert




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