Abstract of INFO-MAC archived encoded Mac binary file
   'gst/grf/pshp/hvs-color-gif-20.hqx'
  Uploaded 10/23/1998   751668 bytes

From: sgust@megsinet.net
Subject: HVS ColorGIF 2.0


HVS ColorGIF 2.0 is a plugin for Photoshop and plugin-compatible paint
programs which produces highly optimized, compact GIFs using the HVS
algorithm. It allows advanced control of color tables, transparency,
dithering, gamma and thresholding. All features are enabled in this demo
for thirty days after installation. Version 2.17 is fully compatbile with
Adobe Photoshop 5, and offers improved color reduction for palettes of
fewer than nine colors.

http://www.digfrontiers.com/color2.html