IMAGECOMPRESSION-MODULE
=======================

Calamus got a built-in image-compression mechanism which may help to
save a little memory. This compression-algorithm bases on the 
"runlength-encoding"-algorithm. Maybe this is one of the most simple
methods of compression, but with certain images it saves a lot of memory.

Naturally are requests (e.g. during the output) on compressed data a
little bit slower than on uncompressed. So in certain cases it makes
sense to have the images uncompressed. That's why we made COMPRESS.

Usage:

Start the module in the "External Modules"-dialog by pressing on the
"EXECUTE"-Button.
A dialog with a few options appears:

- compress/decompress
  Here you can toggle between compressing or decompressing the images

- selected picture-frames/all picture-frames
  Here you can tell the module on which frames it should work.

Remarks:

The runlegth-encoding used in Calamus mainly makes sense with bit-images
(monochrome or duochrome). Because of this by default only bit-images 
are compressed during the import.
The COMPRESS-module is able to compress all other types of images but
it is possible (especially when compressing true-color-images) that
the amount of data after "compression" is bigger than before!


[+++ 03/19/98 inversmedia Verlag GbR, Ulf Dunkel]
