DIF 1.0 (C) 1995 Jonathan Potter

This is a little program designed to allow easy conversion of images
designed for one screen depth to images suitable for another screen depth.
For example, the Magic Workbench icons for DOpus 5 (by Trevor Morris &
Leo Davidson) are all designed for an eight colour screen. If your DOpus
screen (or Workbench screen) is more than eight colours, these images will
be displayed in the wrong colours. DIF can remap these images to allow
their use on a deeper screen.

Usage : DIF FROM/A,TO/A,DEPTH/N/A

            FROM  - source image file
            TO    - destination image file
            DEPTH - desired depth of the converted image

The input file must be an IFF ILBM image. You will normally specify the
depth of your Opus (or Workbench) screen for DEPTH - for instance, my
Workbench screen is 32 colours, so I would specify a DEPTH of 5
(if you don't understand the term "depth", tough luck :)

While this program will work on any depth source image, and produce any
depth destination image, it is really designed for converting 8 colour
images to work on a screen of more than 8 colours. For that reason, the
results when using any other depth input image are undefined (well, they're
not undefined, but I've never tried it, so who knows what will happen :)
You can also specify a smaller depth than the original image, in which
case the higher bitplanes will simply be tossed away.

The easiest way to use this program is probably to set up a DOpus button,
with a function similar to the following :


            AmigaDOS       DIF {fu} {d}{o} {RsEnter desired depth:4}

            Flags :        Do all files
                           Output to window
                           Rescan dest
                           Window close button


DIF works on both RLE-compressed images and non-compressed images
(like brushes).

If you have any problems with it, you can reach me at :

         jpotter@birch.apana.org.au



- Jon

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2719    4344  62.6% -lh5- 1776 Jul 11  1995 DIF/dif
[generic]                 1039    2149  48.3% -lh5- 0d72 Jul 13  1995 DIF/dif.readme
[generic]                  123     141  87.2% -lh5- 4fef Jul 13  1995 file_id.diz
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files    3881    6634  58.5%            Jul 14  1995