The two images are both GIFs.
Are you sure? A GIF file is determined by the compression
algorithm used, not by the "GIF" extension. An intelligently designed
graphics program will ignore any filename extension and read the
file's header (which is embedded in the file itself) to determine the
decompression routine that is needed.
GIF is a Service Mark property of CompuServe, the GIF format is
the copyright property of CompuServe, and Unisys holds the
patent on the the LZW compression algorithm on which the
"Graphics Interchange Format" is based. When the internet was
young Unisys would rattle its royalty swords every couple of years.
For that reason many graphics programs refuse to convert to GIF format
any file not already imported as a GIF.
Finally, just because a file looks like a GIF and quacks like a GIF, it
doesn't necessarily follow that the file is a true (copyright-protected) GIF.
I create many "GIF" files that have the GIF extension, that have GIF
headers that fool graphics programs into thinking they are true GIFs,
that are properly decompressed by LZW decompression, but which
are not true GIFs because they are not compressed by means of the
patented algorithm. Haven't been sued yet
