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More About Colors
******************* THE MONO COLOR CHART ********************
You might like to create 16-color presentations from a laptop
computer, or a monochrome or 'paper white' monitor, or you
might want to use UNIVERSAL MODE, with a Hercules or CGA
system, which cannot access the 16 colors. For these
situations, I have provided a chart of the 16 colors (made in
Universal Mode), so you can pick colors knowledgeably,
instead of guessing among shades of gray. The filename of
this chart is COLORS and to use it simply type MSHOW COLORS
at the DOS prompt.
***************** MORE ABOUT UNIVERSAL MODE *****************
UNIVERSAL MODE is 640 x 200, 16-color graphics, also known as
EGA-LO. Of course it runs on all standard EGA and VGA
systems, but it also runs on Hercules and CGA. Universal mode
is actually higher resolution than VGA-LO, yet is the same
resolution as the two-color CGA-HI. And that's the trick. In
Hercules and CGA, it uses only two colors. So, the idea is
to make a presentation which looks good either way, in color
or mono.
And, at times, making a color presentation that also looks
good in black and white can be a pain in the...but, it's
worth it if you want to reach the largest possible audience,
yet maintain the highest possible graphics standard at the
same time. Here's what you have to watch out for:
* All colors other than black are automatically converted to
white.
* Therefore, if you have overlapping picture elements which
are obviously different colors, on the mono systems there
will be no differentiation.
* You must be particularly careful of overlapping fills. For
instance, if you create a large red ellipse filled with a
polka-dot pattern, then make a yellow circle with a solid
fill inside it, on EGA and VGA, this will look fine. But in
monochrome, the circle will not fill with color. It will
contain the same pattern as the red ellipse around it.
* A Universal Mode presentation running on Hercules will be
compressed somewhat, because it uses the center 640 x 200
pixels of a 720 x 348 screen.
* Large fonts are of slightly different proportions when
displayed on Hercules systems.
* Circles and Ellipses appear in slightly different
proportions on CGA and Hercules systems.
* In most cases, the easiest drawings to create in
Universal Mode are line drawings against a black background,
with very little or no shading, shadowing, etc.
* If creating in Universal for an audience of mixed
computers, you ought to test your presentation on several
different computers (Herc-equipped, CGA-equipped, and
VGA-equipped) before releasing it to the public.
********************* PRINTING TO PAPER *********************
Making a paper copy is a bit like viewing a Universal Mode
picture on a monochrome monitor. All colors which are not
black are printed - actually as black - and black is white.
******************* CHANGED COLOR PALETTE *******************
If you have hooked any .PCX files, or made manual changes to
the color palette (CHANGE COLOR PALETTE in the DOOR option on
the control panel), and if you are using a monochrome or
laptop system, you really ought to get a look at your
pictures on a color monitor, since the changed color palette
might look mighty strange indeed, if you have been guessing
colors while looking at gray scales.
_____________________________________________________________
end of chapter