Re: Cairo-PNG

[Ethan A M. <merritt@u.washington.edu>]

On Friday 09 March 2007 06:22, Pierre wrote:
> Hello,
> 
> On 3/9/07, Peter Danenberg <pc...@wi...> wrote:
> > > My second concern is that we already have gd that does the work
> > > quite well to export in jpeg/gif/png apart from not doing
> > > antialiasing.
> 
> As a side note, GD supports antialiased lines and polygon (without
> transparency).

Sorry to disagree, but in the context of drawing arbitrary curves
with arbitrary line-widths (which is to say practically every line
drawn by gnuplot) libgd through version 2.0.34 does not support
antialiasing.  

> I'm working on the other drawing functions like the 
> filled ellipses or arcs as well as a an improved polygon function
> (full transparency support as well).

IMHO the most dramatic improvement would come from implementing
an anti-aliased brushstroke.  That one change would by itself fix
most of the aliasing artifacts seen in gnuplot png output. 


-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742