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1995-01-12
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AMIGA JPEG V1.03
Copyright © 1992-1993 by D. Williams
Released as Freeware - Aug 23 1992
ABOUT: AMIGA JPEG is a simple to use JPEG viewer, compressor and
decompressor. This software is based in part on the work of
the Independent JPEG Group and is freely distributable as long
as this file is included.
SETUP: AMIGA JPEG requires the files vjpeg, cjpeg and djpeg to be in
the C: directory, or in the directory where AMIGA JPEG is located,
or anywhere in the search path. If you have a 68020-040, then rename
cjpeg020 to cjpeg, and djpeg020 to djpeg and use them instead.
The ARP library is also required to be in the LIBS: directory.
******************** VIEW JPEG ********************
The viewer is not a true representation of the quality of the
JPEG file, it is just a convenient way to look at a JPEG file
without saving the output.
Smoothing: This is Cross Block Smoothing. Turning this button on will
make images compressed with very low quality values (0-25)
look better.
Interlace: If this button is on, the viewing screen is set to 320 x 400,
otherwise it is set to 320 x 200.
Width : Setting this button to HALF will allow you view pictures that
are wider than 320 pixels.
******************** COMPRESS JPEG ********************
Quality : This is the quality value to use when compressing the image.
The lowest setting is 0 and the highest is 100. The lower
settings offer greater compression at the exspense of image
quality, and the higher settings offer greater image quality
at the exspense of compression. The default setting of 75 is
a very good compromise between image quality and compression.
If set to 100, there is no loss of image quality.
Entropy : Turning this button on will generate slightly smaller JPEG
output files. This feature has no affect on image quality
but requires more memory if on.
Input : Select the type of file to compress.
******************** DECOMPRESS JPEG ********************
Smoothing: This is Cross Block Smoothing. Turning this button on will
make images compressed with very low quality values (0-25)
look better when decompressed.
Dithering: Turning this button on will generate better looking output
files when decompressing to a format with less colors than the
original image. (EXAMPLE: IFF24 to JPEG to GIF)
Output : Select the type of output file. The HAM selection does not
generate the best possible HAM picture. It is better to select
IFF24 as the output, and then use a program like T.A.D. to
convert to HAM.
******************** CHANGES ********************
Version 1.00 : First release.
Version 1.01 : Fixed bug that would hang program on exit if sound was
playing in the background.
Version 1.02 : Spaces are now allowed in the pathname.
Version 1.03 : Added support for a better and faster viewer. (2.04 and up)
******************** 2.04 AND UP ********************
If you are using Workbench 2.04 or higher, you can use VT
instead of vjpeg as a viewer. VT is short for VIEWTEK and is
far superior to vjpeg in terms of speed and ability. VT will
display JPEG's, GIF's, and almost all ILBM's including IFF,
HAM, SHAM, IFF24, CTBL, PCHG and even IFF ANIMS.
To use VIEWTEK, simply put the file VT in your C: directory.
The Smoothing, Interlace, and Width buttons are not used with VT.
VIEWTEK 1.00 was written by Thomas Krehbiel in November 1992.