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- ******************* ABOUT GRAPHICS MODES ********************
-
- When The Multimedia Workshop starts up, it automatically
- detects the graphics card in your computer and adjusts
- accordingly. With most graphics cards there are two or more
- graphics modes available in which you can work. For instance,
- if you have an EGA system, you can create pictures in one of
- two EGA modes or in one of two CGA modes. But if you use the
- EGA-High mode, other computers with only CGA will not be able
- to display your presentations properly. So, you'll have to
- decide what mode to use. Of course, your presentations will
- look better if you use the highest resolution mode your
- computer supports, but at the cost of losing the portion of
- your audience who have only lower resolution equipment.
-
- Resolutions are measured in pixels, the little dots of
- which everything that appears on your monitor are composed.
-
- These are the modes supported by The Multimedia Workshop:
-
- CGA-LO 320 x 200 4-color
- CGA-HI 640 x 200 2-color
- EGA-LO 640 x 200 16-color
- (also called UNIVERSAL MODE)
- EGA-HI 640 x 350 16-color
- Hercules MONO 720 x 348 2-color
- VGA-HI 640 x 480 16-color
- VGA-Lo 320 x 200 256-color
-
- When starting a new picture, your computer will present a
- menu of the graphics modes available on your particular
- computer. (If you have HERCULES, there is only one choice,
- so the menu is skipped.)
-
- If your computer supports it, EGA-LO 16-color, also
- called UNIVERSAL MODE, is a good choice. It is reasonably
- high resolution, but plays on all standard EGA and VGA
- computers. But also, it plays on Hercules and CGA systems.
- UNIVERSAL MODE will still work on CGA and Herc, but only in
- monochrome (2-color). Therefore, you can make a presentation
- which looks good on expensive equipment, yet still plays to
- the rest of the IBM-compatible audience!
-
- If you have CGA or Hercules equipment, you can still
- write in UNIVERSAL MODE, and I'll tell you more about that
- later.
-
- Let's look into the other modes in some more detail:
-
- CGA-LO 320 x 200 4-color: The people who marketed CGA color
- systems used to tell you that CGA can display up to 16 colors
- at a time, and that's true - in text mode. But in graphics,
- only 4 colors can be on the screen at a time. There is a
- little trick built into The Multimedia Workshop, however,
- which makes it seem like there is a little more color
- variety. You can control the 'background' color. In other
- words, one of the four colors can be changed within a
- picture. More about this later.
-
- CGA-HI 640 x 200 2-color: This is the same resolution as the
- EGA-LO mode, but monochrome. It has twice as many pixels as
- the lowest VGA resolution . So, even though it is CGA, it is
- reasonably good resolution. When you write a presentation in
- UNIVERSAL MODE, on a CGA system, it uses this mode, and just
- leaves out the color. It does this by making all colors
- which are not black, white.
-
- This is a very presentable resolution, as is evidenced
- by some successful shareware products you might have seen,
- NON-MEDICAL PAIN RELIEF, BICYCLE TUNE-UP, and OXY-ACETYLENE
- WELDING, which were created with earlier versions of
- The Multimedia Workshop.
-
- UNIVERSAL MODE (also known as EGA-LO) 640 x 200 16-color &
- 2-color: If you have an EGA or VGA system, you can write in
- this mode directly using all 16 colors. When your finished
- product is displayed on other EGA and VGA systems, the end
- users will see 16 colors, but if used on a monochrome EGA,
- Hercules or CGA system, the same presentation, in the same
- resolution, will appear in monochrome (2 colors). This is
- done by making all colors other than black, white. The best
- way to write in UNIVERSAL MODE for the widest variety of
- computers, is to keep your backgrounds mostly black, and make
- sure differing colors are not essential to your pictures.
-
- Also, be careful about using fills (filling an area with
- solid color or a pattern), they don't work exactly the same
- on different graphics displays. Use fills minimally, or check
- your Universal Modes presentations on several different
- computers.
-
- Writing a UNIVERSAL MODE presentation to run on a variety
- of monitors is difficult. Circles, ellipses and text adjust
- automatically so that round objects come out circular, not
- elliptical, and so your presentations should be checked on
- various systems if you use these graphics objects.
-
- EGA-HI 640 x 350: This is almost VGA, but not all EGA systems
- support this mode. The first EGA cards had only 64 kilobytes
- of display RAM and could not display this.
-
- HERCULES MONO 720 x 348: This is a rather weird resolution,
- but is still quite common, especially in business
- applications. If you choose this resolution specifically,
- only Hercules and VGA systems will be able to display it. In
- fact, some VGA and most laptop/notebook VGA systems will
- distort it to fit within their 640 horizontal pixel
- resolution. If your computer supports only this graphics
- mode, you can still create in UNIVERSAL MODE, and I'll tell
- you more about that later.
-
- VGA-Hi 640 x 480 16-color: If your computer can support this
- mode, you can also write presentations in all the other
- modes. However, if you create in this mode, only those folks
- who also have VGA on their computers can see your
- presentations.
-
- VGA-Lo 320 x 200 256-color: Again, you'll be restricting your
- audience to owners of VGA equipment if you use this mode.
- Although the resolution is quite low, with so many colors,
- very realistic pictures can be drawn. VGA-LO supports fewer
- fill patterns and type faces and the FASTMODE option does
- not work with this mode. BLOW OFF DELAYS works fine.
-
- NOTE: On many VGA cards, Hercules mode will run only if the
- Hercules mode is pre-selected with a bit of software provided
- with your video card. If you ignore this fact, when you try
- to use The Multimedia Workshop in Hercules mode on many VGA
- systems, the light goes out and you have to reboot.
-
- .PCX FILES
-
- PCX is the most common format for storing pictures and
- clip-art on disks. There are many wonderful works of art
- available in these files. Many are public domain. Within
- the .PCX family are several variations, and with The
- Multimedia Workshop you can use most of them in your own
- presentations.
-
- You can display .PCX files in any of the seven video
- modes, although you usually must use the mode in which the
- chosen .PCX file was created.
-
- In other words, if you have a 256-color VGA .PCX file,
- you won't be able to use it in Hercules mode. There is a
- facility built into The Multimedia Workshop to report on the
- format of a .PCX file which you are considering for use. If
- you are writing with a VGA-equipped computer, for other VGA
- computers, you can use almost anything in your presentation,
- due to the automatic video mode switching capabilities of
- MSHOW and The Multimedia Workshop. For instance, you can
- chain a CGA 2-color, a CGA 4-color, and a VGA-256 color
- picture together in presentation!
-
- You can also attempt to bring mis-matched video mode .PCX
- files into your pictures. Sometimes you can cross formats
- with no difficulty, sometimes the computer will crash in the
- attempt, but you CAN always try it and see what happens!
-
- In some cases, you'll only get the upper left corner of a
- picture when attempting to display a high-resolution format
- picture at a low resolution.
-
- If you have an EGA or VGA-equipped machine, keep in mind
- that when creating a presentation in Universal Mode, keep in
- mind that the .PCX files which work in Universal Mode on your
- computer (actually EGA-LO 16-color) will not work when shown
- on a Hercules or CGA-equipped computer, because .PCX files
- are loaded into specific memory addresses on various graphics
- cards, and cannot make the transition from one type to
- another.
- _____________________________________________________________
- end of chapter
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