On 2008-01-17 19:27-0000 Andrew Ross wrote: >> [...]Andrew (Ross), do you confirm the above qualitative problem with the png >> result? > > Alan, I can confirm that I observe exactly the same behaviour with both > debian oldstable and ubuntu gutsy (latest stable).
>> [...]Anyhow, Andrew, the apparent non-linear transformation between >> transparency >> index (alpha channel) and transparency result for both jpeg and png results >> from libgd is a mystery which I hope you will be able to solve. > > I'm currently equally perplexed. Hopefully we can come up with a simple > test case to try out some ideas. Hi Andrew: As you know I don't have access to cairo at the moment. However, you do. How does the first page of example 30 compare for transparency between png and pngcairo? My impression is the png version looks okay. If it happens that pngcairo has the same transparency interpretation as png for the first page, but not the second, that might be an important clue about where the trouble lies. 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 __________________________ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
