                             TWEAK.TXT

When I write programs that make pictures out of fields of mathematical
formulas in the true color mode, I can assign values to each of the red,
green, and, blue color plains of any pixel. Sometimes these primary colors
may be overemphasized, and the whole image may appear to be only
shades of red, green, or blue. But, if you have an image editor that will let
you see and edit a "Color Map", then a fuller spectrum of colors may be
achieved. This is very difficult to explain with so few words; but... 

When you open the file in an image editor that has a color map,
view the color map. You should see a square box with a diagonal line
inside from the bottom left to top right corner. This line represents
the relationship between the values of colors stored in your bitmap, 
(0 to 255) and the intensity at which they will appear on the screen.
Without changing anything, they will have a perfect 1 to 1 relation;
hence the diagonal line. You may have several methods of changing this
line. Highlight-Shadow, Gamma, 1/4 Tone, 1/8 Tone, or Free Hand Draw
may be some of them. If you can, choose Highlight-Shadow and slide
the top right hand corner end of the line a little bit to the left.
You can change this line for each of the three color plains individually,
or all three at once. The composite of all three colors is usually called
Luminance. Doing this will bring more of the intermediate colors out in the 
picture - cyan, magenta, yellow. You can do some really weird things with
a color map, especially with  math oriented pictures. This is because
of the precise layout of color transitions. Photos are essentially random.
Mess with it for a while, but remember, when you go to print something,
the darker it is on the screen, the more ink you will use. Dark pictures
that don't have much contrast print out looking like mud.

