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- Path: sparky!uunet!seismo!ukma!cs.widener.edu!dsinc!satalink!bert.tyler
- From: bert.tyler@satalink.com (Bert Tyler)
- Newsgroups: sci.fractals
- Subject: Winfr173 and GIF
- Message-ID: <1173.1004.uupcb@satalink.com>
- Date: 13 Nov 92 10:02:00 GMT
- Reply-To: bert.tyler@satalink.com (Bert Tyler)
- Organization: Datamax/Satalink Connection * Ivyland, PA (215) 443-9434
- Lines: 27
-
- BH>Why would a normal GIF (ex NASA mars1 photo) display ok with Fractint 17.2
- BH>but not come out right (loses color?) when attempt to display it using
- BH>Winfr173 ?
-
- Probably because your Windows video driver takes away some of the
- colors for its own use.
-
- The "standard VGA" Windows video driver uses only 16 colors, and they
- can't be altered. Even a "256-color" Windows video driver reserves
- 20 colors for its own use, and only lets application programs such as
- Winfract alter the other 236. ("True-color" Windows video drivers
- let applications programs set their colors at will.)
-
- Winfract doesn't attempt to dither its internal colors into a scheme
- that accounts for the above limitations (who knows what those
- limitations will be under Windows 3.2?). It just hands its
- device-independent bitmaps over to the Windows video driver and says,
- in effect, "here - display this". The Windows video driver then
- typically attempts to reduce Winfract's palette into one that matches
- the available colors using a "best fit" approach that doesn't always
- fit so well. My 256-color Windows driver, for example, often
- matches the last 20 colors to a stylish solid-black <grin>.
-
- Bert Tyler (bert.tyler@satalink.com)
- ---
- . DeLuxe./386 1.25 #343sa . Did you expect mere proof to sway my opinion?
-
-