> the format to be
> portable so that it can be used by all software.
> Are there other
> considerations that I have neglected?
tiff can save arbritary information in "tags" which
sometimes other programs cant read, for example a tiff
saved in photoshop has a pair that gimp cant read. but
this can save information like an ICC profile or gamma
information. png is probably the smallest portable
format, but the only thing it saves besides pixel data
is gamma. another advantage of tiff is the ability to
store more than one image in a file. an image viewer
can use this to read/write thumbnails and the like.
gif is also a bad choice because of its limited color
depth (256 color pallet). if you want to avoid
proprietary nastiness make sure you dont save tiffs
with LZW compression. PNM is simply the easiest format
to read/write and probably the most portable since
images can be stored in plain text.
overall, tif is the most flexible and should probably
be your default, with png for when you need smaller
file sizes.
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