Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!clmqt!kenb
From: kenb@clmqt.marquette.Mi.US (Ken Baynard)
Newsgroups: comp.sys.amiga
Subject: Re: RGB to HAM IFF
Message-ID: <55@clmqt.marquette.Mi.US>
Date: 9 Oct 89 21:55:44 GMT
References: <495@nigel.udel.EDU> <333@amgraf.UUCP> <1976@convex.UUCP>
Organization: Enterprise Information System, Marquette, MI
Lines: 31

swarren@eugene.uucp (Steve Warren) writes:

>In article <333@amgraf.UUCP> huver@amgraf.UUCP (Huver) writes:

>>In article <495@nigel.udel.EDU>, webb@udel.edu (David Webb) forwarded comment
>>from Fred Mitchell (mitchell@cbmvax.uucp) on converting RGB bitmap to HAM:

>  [...bitplane reduction, 16-color palette picking stuff deleted]

>>But the original question was:

>>>>   Has anyone worked out a method of converting RGBs to HAM. I have
>>>>   three B/W images (8 bits/pixel), and I would like to covert them
>>>>   to a HAM image. If somebody could show me the way I would not writing
>>>>   the C-code and making it public...
>             ...

>I never used it myself, but it seems like the digiview digitizer
>came with some software that does that (it uses a filter to digitize
>the image in three passes).

>	  {uunet,sun}!convex!swarren; swarren@convex.COM
  Well you're close. Digi-View won't actually do the coloring for
you. It can be used to modify the picture however in terms of
intensity, brightness, and contrast. To take a B/W or say 16 gray
scale picture, its best to use either Digi Paint or Photon Paint.
Using the subtract option with either of these, you can color in the
various shades of gray accoringly and at the end have a HAM picture.
I've used the technique quite a bit with fairly impressive results.
The key is to have a good B/W picture to start with. Hope this helps
a bit.