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- Path: grafix.xs4all.nl!john.hendrikx
- Date: Sat, 06 Jan 96 22:16:51 GMT+1
- Newsgroups: comp.sys.amiga.misc
- Distribution: world
- Subject: Re: Hombre history - RISC selection
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- From: john.hendrikx@grafix.xs4all.nl (John Hendrikx)
- Message-ID: <john.hendrikx.44bw@grafix.xs4all.nl>
- Organization: Grafix Attack BBS Holland
-
- In a message of 03 Jan 96 Lasse Olsen wrote to All:
-
- LO> : >That's garbage. While each pixel in HAM8 just has 256 possible
- LO> shades : >you can reach more colors than a 16bit screen.
-
- LO> : <laugh> Pray tell, how??
-
- LO> Because 16-bit modes has only 5-bits (32 colors) of RGB,
- LO> Ham8 has 8-bits (256 colors).
- LO> For a number of graphic-styles this is better.
-
- Wrong at both counts. 16-bit modes has 5-bits for Red and Blue and 6 for
- Green. HAM8 has 6-bits for Red, Green and Blue, BUT, it can only change one of
- them at the time. So although HAM8 can display more colors, it usually has to
- 'pray' that changing only the Red, Green or Blue component will actually
- produce a good match of the color which is REALLY wanted.
-
- LO> : >And dithering is as effective with HAM as with other displays. In
- LO> fact, : >HAM is some kind of automatic dithering.
-
- LO> : Dithering with HAM is FAR less effective than true-colour displays,
- LO> due to : fringing. And of course HAM is *NEVER* as clear...
-
- LO> There is no dithering involved in ham.
-
- Correct, but if you use Dithering with HAM the result won't look that much
- better, while dithering can do miracles for other types of screens (like 16-bit
- screens).
-
- LO> : And HAM is some kind of automatic dithering? Crap. It's just a
- LO> hardware hack in : the chips that forces 4096 colours out of HAM6, and
- LO> 65536 from HAM8...
-
- LO> Check your facts. Ham8 is for all practical reasons limited
- LO> to 262,000 colors on screen at once with, one-pixel changes.
- LO> Cheers...
-
- Actually it is limited to 16 million colors, but only if you set the
- base-palette right. Of course for all practical uses you'll rarely have more
- than say 10000 colors on screen, so this is not very interesting anyway.
-
- Grtz John
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