dvipng: Encapsulated PostScript
5.1 Encapsulated PostScript
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When an EPS file is included, a call to GhostScript is performed to
produce a bitmapped image that can be included. The default is to
produce an image with transparent background, at the same size as the
DVI page currently being converted to PNG, and include that as
foreground on the PNG. Of course, if the image is to be cropped, that is
done. The included image will be a truecolor image, so for maximum
performance the output PNG will be in truecolor mode as well.
This conversion needs the 'pngalpha' output device to be present in
your copy of GhostScript. If that device is not present, or you use the
'--palette' switch or request GIF output, the fallback is to use the
'png16m' device to produce a cropped opaque image for inclusion. Other
relevant switches are '--noghostscript' and '--nogssafer'. 
Option
details.
The most common problem with including graphics is an incorrect
bounding box. Complain to whoever wrote the software that generated the
file if the bounding box is indeed incorrect. An adjusted boundingbox
can be specified in the '\includegraphics' call, as in this example
(using 'graphicx'):
\includegraphics[bb=10 20 100 200]{imagename.eps}
Info Catalog
dvipng: Graphics
dvipng: Bitmapped graphics