On 2008-01-08 12:51-0000 Andrew Ross wrote:

>
> Hazen,
>
> Many thanks for this. It's a useful feature to have and I'm glad someone
> has finally got round to starting to code it in. I've added support for
> alpha values to the gd driver too so hopefully more people can test it out.
>
> Note that libgd uses integer alpha values in the range 0-127 with 0
> being opaque. This is quite different to the convention in cairo, and
> also now in plplot. I'm happy to stick with the 0.0-1.0 range with 1.0
> as opaque though since this seems more natural. I'm fairly sure this is
> what I have seen elsewhere too.

My thanks to both Hazen for the initial effort and Andrew for the libgd
followup.  There are no obvious build problems on Debian testing with the
new alpha transparency capability, and the (libgd) PNG results for example
30 look like a nice demonstration of the new capability.

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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