I have implemented just enough of a libwmf back-end driver for
ImageMagick (http://www.imagemagick.org) in order to render the
clipart/sample.wmf file delivered with libwmf. The rendering quality
is clearly much better than when using the existing GD back-end.
I have attached two PNG files to illustrate the improved rendering
available via ImageMagick. The GD version (sample_gd.png) has
substantial aliasing problems which leads to jagged lines, and white
spots around the skier's collar. The ImageMagick version
(sample_im.png) looks much better, with smooth lines, and no obvious
defects. This significant improvement in quality is in spite of the
rendered TrueColor image being reduced to 32 colors (the GD version
uses only 9). Sixteen colors looks good too.
In addition to improvements in output quality, use of ImageMagick for
the backend driver immediately adds the ability to write over 50 image