28 February 1994
This directory has two files that contain the hcompress image
compression package:

hcompress.tar.Z
    This is a compressed tar file, which must be transferred using BINARY
    mode in FTP.  You can extract the files on a Unix system by doing
        zcat hcompress.tar.Z | tar xvf -
    This will create a directory called ./hcompress (with some subdirectories.)
    The hcompress/aareadme file gives installation information.

hcompress.bck
    This is a VMS backup file, which must be transferred using BINARY mode
    in FTP.  When retrieved via anonymous FTP, this file is created on your
    system with an incorrect blocksize.  To fix this, you must get 2 additional
    files: BACKUP.COM (using ASCII mode) and MODIFY.EXE (using BINARY mode).
    Then you can extract the files on a VMS system by doing
        @BACKUP
    This will create a directory called [.HCOMPRESS] (with some
    subdirectories.)  The [.HCOMPRESS]AAREADME file gives installation
    information.

This version (28 February 1994) corrects one bug in the decompression
from the previous version (20 April 1992).  The effect of this
bug was only noticeable for lossless compression of odd-sized
images (images with dimensions that are not a power of 2.)  The
compressed files in that case were correct, but the decompressed
images could have pixel values that differed by +/- 1 count compared
to the original.  If you have any old compressed files, they will
decompress properly using this new version of the software.

Only hinv.c has changed from the previous version.

I know of no other bugs that have been discovered (but would welcome
reports of such.)