Here are the Independent JPEG Group jpeg compress and decompressor (version 2),
compiled for the Amiga with with SAS/C 5.10a.

files:
	AMIGA-NOTE - this file
	README	 - original JPEG source package readme file
	cjpeg	 - jpeg compressor executable
	djpeg	 - jpeg decompressor executable
	cjpeg020 - jpeg compressor optimized for 68020 and higher processors.
	djpeg020 - jpeg decompressor optimized for 68020 and higher proc.

extensions to the original:

 cjpeg can read IFF ILBM files, including HAM and 24-bit ILBM.

 djpeg can directly produce IFF ILBM output, including 24-bit,
 4-bit grayscale and HAM.

 Quantized ILBM pictures (-q option) don't look good because of the single
 pass color quantization algorithm used (same problem with GIF files).

 Also, HAM conversion uses a really simple algorithm, and may not look
 very good (of course depending on the picture).

 If you want high quality output, use either PPM (default) or 24-bit ILBM
 output and then convert with for example ADPRO (commercial) or wasp.
 (note: wasp reads both PPM and 24-bit ILBM format, but djpeg (this version)
 writes PPM files faster than ILBM files)

 You can also use 24-bit ILBM output with cards/devices such as HAM-E,
 DCTV, Video Toaster, GVP Impact Vision etc.

usage:

 compressor:

  cjpeg [-Q quality] [-o] [-T] [-d] source-file destination-file

 the optional quality parameter affects compressed file size and picture
 quality (the amount 'loss' of information in the compression)
 range is 0 to 100, default is 75.

 source file can be GIF, PPM, Targa or ILBM format (including HAM
 and 24-bit ILBM). destination will be, of course, in JPEG JFIF format.

 other options:

  -T	Targa input file mode.

  -o	optimize entropy encoding parameters.

  -d	debug mode.


 decompressor:

  djpeg [-b] [-q colors] [-D] [-g] [-G] [-T] [-I] [-H] [-d] source-file dest-file

 options:

  -b -	cross-block smoothing. may increase image quality with pictures
	compressed with high -Q values.

  -q colors quantize the colors and generate a file with the given amount
	of colors. note that a single pass quantization algorithm is used,
	resulting in non-optimal image quality.

  -D    do not use dithering in quantization (changed from previous version).

  -g	generate grayscale image.

  -G	select GIF output file format.

  -T	select Targa output file format

  -I	select IFF ILBM output file format. if this is selected with -q,
	a normal ILBM file will be created; with -g, a grayscale 4-bitplane
	ILBM image will be created; otherwise, a 24-bit ILBM file format
	will be used.

  -H	select IFF ILBM HAM output file format. this uses a simple
	algorithm resulting in non-optimal image quality. 

  -d	debug mode.

 output file will be in raw PPM format if no other options are given.
 source file must be in JPEG JFIF format (naturally...)

authors:

 Original JPEG compressor/decompressor software is the work of Tom Lane,
 Philip Gladstone, Luis Ortiz, and other members of the independent JPEG
 group.

 This port was done by Timo Rossi (email: trossi@jyu.fi)
 (original v2 SAS/C makefile by Ed Hanway (sisd!jeh@uunet.uu.net))