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From: Out of Order <psamuels@hmc.edu>
Newsgroups: rec.arts.ascii,alt.ascii-art,alt.binaries.pictures.ascii
Subject: Answer: Light-On-Dark to Dark-On-Light Converters?
Date: 2 Oct 1994 02:57:12 -0500
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And The Scarecrow spake unto us, saying:

>    But as to flipping the light and dark of a pic while it is ASCII, I 
> don't know.  Dose anybody recall if there is a program or script for this?

In UNIX csh you could alias a tr command something like:

alias invert "tr '[\040-\177]' 'QWERTYUIOP...' < \!*"

(The QWERTYUIOP... is whatever order you think the 96 characters
between 32 and 127 should be in.)

To use it you would then type invert filename and it'd display the
inverted one on the screen.  Save with invert filename>filename2.

I'm not about to think that hard at this time of night, but if anyone
tries this, please post the complete alias and an example of what it
can do.

 __ ___  __  __  _  ___  _  ___      _      ___  _  ___  _  __  __  ___ __
|_|  _| / | |_| / \. _| / \. |  | | / \ | |  | ./ \ |_ ./ \ |_| | \ |_  |_|
/ | __| \_| / | \_/   | \_/  |  |_| \_/ |_|  |  \_/ |   \_/ | \ |_/ |__ | \
          ude.cmh@sleumasp                       psamuels@hmc.edu
                  (nosleumaS reteP r(O)r Peter Samuelson)

[October 17 -- It's Time!  Ask me for details!]