Provided by: gif2png_2.5.8-1build1_amd64
web2png - convert a web tree from using GIFs to using PNGs
web2png [-adnrtv] [directory...]
Sometimes it's possible to convert transparent GIFs without altering the appearance of the page, by knowing from context that they will always place within an area of fixed and solid color. Web2png can't deduce when this will be, so it doesn't try; but it may be useful to apply gif2png with the -b option by hand.
The algorithm for fixing HTTP URLs is not foolproof. It could be confused into incorrectly patching an HTTP URL reference to a GIF into an invalid reference to a PNG if the GIF matches a local target GIF by both basename and binary content, but actually lives on another host. This program does not automatically convert CGIs; you'll have to do that by hand. Other dynamic-content methods (such as server-side inclusions) may also require hand-hacking. The program cannot tell converted from preexisting PNGs; if you have PNGs with the same stem name as corresponding GIFs but carrying different information, the -r mode will clobber them.
Eric S. Raymond <email@example.com>, October 1999. Slightly modified for Debian by Aaron Isotton <firstname.lastname@example.org>.