bill@pro-gateway.cts.com (Bill Long, SysOp) (12/05/90)
I'm an Apple II user and don't keep up with the IBM world to much, and I have a question for you IBM people. With VGA, how many colors are available, and how many can be on-screen at one time? | ProLine: bill@pro-gateway |Internet: bill@pro-gateway.cts.com | UUCP: crash!pro-gateway!bill | ARPA: crash!pro-gateway!bill@nosc.mil | BITNET: bill%pro-gateway.cts.com@nosc.mil +----------"Maturity is overrated" - Garfield-------->Pro-Gateway 214/644-5113
rusbasra@mentor.cc.purdue.edu (Bob Rusbasan) (12/06/90)
In article <6109@crash.cts.com> bill@pro-gateway.cts.com (Bill Long, SysOp) writes: >With VGA, how many colors are available, 262,144 (2^18). >and how many can be on-screen at one time? 256 in the standard medium resolution mode (320x200). There are several nonstandard higher-resolution 256-color modes. 16 colors with resolution up to 640x480 (higher for super VGA). =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- / Bob Rusbasan | "So many pitchforks, so little hay." \ / bob@en.ecn.purdue.edu | - Old MacDonald in hell \ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
ron@woan (Ronald S. Woan) (12/06/90)
In article <6109@crash.cts.com>, bill@pro-gateway.cts.com (Bill Long, SysOp) writes: bill> With VGA, how many colors are available, and how many can be bill> on-screen at one time? Using standard VGA: 640x480 with 16 simultaneous 320x200 with 256 simultaneous Of couse most cards are super VGA and support: 640x400 with 256 simultaneous 512K cards: 640x480 with 256 simultaneous 800x600 with 256 simultaneous (except for Western Digital, aka Paradise) 1024x768 with 16 simultaneous 1 MB cards: 1024 x 768 with 256 simultaneous +-----All Views Expressed Are My Own And Are Not Necessarily Shared By------+ +------------------------------My Employer----------------------------------+ + Ronald S. Woan woan@peyote.cactus.org or woan%austin@iinus1.ibm.com + + other email addresses Prodigy: XTCR74A Compuserve: 73530,2537 +
ergo@netcom.UUCP (Isaac Rabinovitch) (12/07/90)
In <6109@crash.cts.com> bill@pro-gateway.cts.com (Bill Long, SysOp) writes: >I'm an Apple II user and don't keep up with the IBM world to much, and I have >a question for you IBM people. >With VGA, how many colors are available, and how many can be on-screen at one >time? Depends on the VGA card and the monitor. If you spend enough, you can theoretically generate *any* color, since the intensity of the three colors in a given pixel is infinitely variable. On such a setup, you can have 256 colors on screen at once. If your needs (or budget!) are more modest, one can get a card/monitor combo that only does 16 colors at once (256 possible) for $300-$400. In some cases, such low-cost setups can can get more colors, or "super" (> 640 x 480) resolution, but not both. The limiting factor is usually the monitor, not the card. Read the hardware documentation carefully before experimenting, since you can damage a monitor by trying to get more color or resolution out of it than it was designed to give. Such damage can happen immediately if you're using a TTL monitor. Analog monitors (the only kind you should use with VGA anyway, and the only kind some VGA cards support) are harder to damage, so careful experimentation is quite safe, but don't leave a monitor in a "bad" mode for more than a minute or two. In particular, don't try to run an interlaced monitor in non-interlaced mode. (If you have the "flicker" problem which interlaced monitors are notorious for, try stepping down the resolution.) I myself only recently got into VGA myself. Before I used a Hercules card, because CGA text mode was unacceptable, and EGA and VGA were too expensive. This was a real pain, because so much software assumes you have at least CGA software compatibility, and often locks up the machine if you don't. Also, cheap Hercules clones often destroy their monitors, and even the good ones will do it if you're careless with the software. Now that VGA has come down in price, I think any TTL video card, even the ones that do both CGA and Hercules, is a bad buy. -- ergo@netcom.uucp Isaac Rabinovitch netcom!ergo@apple.com Silicon Valley, CA {apple,amdahl,claris}!netcom!ergo THIS STATEMENT IS VERIFIABLY, IRREFUTABLY TRUE!
tris@alzabo.uucp (Tris Orendorff) (12/07/90)
bill@pro-gateway.cts.com (Bill Long, SysOp) writes: >I'm an Apple II user and don't keep up with the IBM world to much, and I have >a question for you IBM people. >With VGA, how many colors are available, and how many can be on-screen at one >time? Normal VGA resolutions are: (width x height x number of colors) VGA: 640 x 480 x 2 VGA: 640 x 480 x 16 VGA: 320 x 200 x 256 VGA is also capable of emulating the older video standards: CGA: 640 x 200 x 2 CGA: 320 x 200 x 4 EGA: 640 x 350 x 2 EGA: 640 x 350 x 4 EGA: 640 x 350 x 16 Also, most VGA cards can do higher res screens: EVGA: 800 x 600 x 16 EVGA: 640 x 400 x 256 EVGA: 640 x 480 x 256 EVGA: 800 x 600 x 256 EVGA: 1024 x 768 x 16 The 256 color screens choose from a 256000 color palette. -- Sincerely Yours Tris Orendorff tris@alzabo.uucp ----------------------------------------------------------------------- ALGERNON: The doctors found out that Bunbury could not live ... so Bunbury died. LADY BRACKNELL: He seems to have had great confidence in the opinion of his physicians.
silver@xrtll.uucp (Hi Ho Silver) (12/10/90)
In article <6109@crash.cts.com> bill@pro-gateway.cts.com (Bill Long, SysOp) writes:
$With VGA, how many colors are available, and how many can be on-screen at one
$time?
VGA uses 6 bits for each of red, green and blue, so you have a palette of
2^(6*3)=256K colours to choose from. Depending on the display mode you're
using, you may have up to 256 colours on the screen at a time. Note, however,
that since there are only 64 values for each of the three primaries, and
that gray is produced by an equal value in each primary, you can only get
64-level grayscale.
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