Short: Convert IFF to GIF

AMGIF vn 2.0 - Amiga IFF to GIF converter

- The only real change between earlier versions of Amgif, and this one
is the addition of support for Extra-Halfbrite mode.


Converts Amiga IFF pictures to GIF.  Supports 320x200 & 320x400 in up to
32 colors or HAM mode, and 640x200 & 640x400 in up to 16 colors.  HAM mode
pictures are reduced to 256 colors.  Also supports Extra-Halfbrite modes.

This program is basically the same as IFF2GIF, by Steve Wilhite (and uses
the modules COMPRESS.C and BUILDGIF.C from that program...), but will also
convert HAM pictures and Extra-Halfbrite pictures.  It also might be a bit
faster with non-HAM pictures.  It is used identically to IFF2GIF.

It does, however, require a significant amount of memory to run.  (roughly
200-300K, depending on resolution...)  It can also require over 512K for
pictures in Hires interlaced mode (ie 640 x 400).  If you only have 512K
and run out of memory on higher resolution images, you can still
use IFF2GIF for those images.

HAM images can take a significant amount of time to encode, mainly due to
the calculations required to sort and remap the colors.  HAM images are
reduced to a 256 color map, choosing the most frequently used colors for
the color map, and remapping all the other used colors to the nearest
match in that color map.  Many HAM images will not suffer much from this.
Others may suffer significantly.  It depends on the image.

Thanks to Steve Wilhite, who wrote COMPRESS.C and BUILDGIF.C, which
are used in this program.  He also wrote IFF2GIF.C, which I heavily
remodeled to become AMGIF.

Thanks also to Jim Kent, who wrote JIFF.C, which is also used, in
somewhat modified form, in this program to read IFF pics.

-->Steve Bennett           Compuserve:[76702,1071]        01/31/90