On 2010-01-05 01:03-0700 Jerry wrote:

> The second page of example 30 using the psc driver on OS X is a giant
> red near-rectangle with a bit of black border.

The ps and psttf device drivers do not (currently) support alpha
transparency.  So a red transparency gradient as in example 30 page 2 is
rendered as a red opaque rectangle just like you have described. -dev xwin
shows the same bad result for the same reason.  Use -dev pscairo or -dev
epsqt to show proper PostScript results for example 30.

>From http://en.wikipedia.org/wiki/Transparency_(graphic) as well as our
epsqt and pscairo results, it appears the PostScript standard supports
transparency. Thus, if anybody has time to do the work, it should be
possible and definitely worthwhile to upgrade the ps and psttf device
drivers to support transparency as well.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
__________________________

Linux-powered Science
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