> > 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. >
The 0.0-1.0 range is also used in Tk 8.5 with 0 completely transparant and 1 completely opaque. So that supports your impression. The libgd convention seems rather arbitrary to me (127 as the maximum? Why not 255, as with the RGB values?) Regards, Arjen ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
