From: Alan W. I. <ir...@be...> - 2010-01-05 10:12:10
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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 __________________________ |