Message-ID:	<3B2C0FEE.670D5EE7@mailandnews.com>
From:	"J. Weeks" <jweeks AT mailandnews DOT com>
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Subject:	Re: So lemme get this straight
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Date:	Sat, 16 Jun 2001 22:03:26 -0400
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To:	djgpp AT delorie DOT com
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PM wrote:
> 
> Ok so when talking about colour considerations when programming in the
> different colour depths, is this right?
> 
> When programming in 256 colour or 8 bit mode, a palette is used, which
> is an 256 elemented array of the RGB structure. Correct?
> The palette is used to manipulate colour.
> 
> When programming in high colour or true colour, what is used to
> manipulate colour here? is an array of 16 million RGB Structures used?

In 24-bit mode, the 24-bit value you place in video memory contains the
intensities of red, green and blue in it.
8:8:8  <- # of bits
R:G:B  <- what they represent

In 16-bit mode I believe it's 5:6:5, R:G:B.

32-bit mode is the same as 24-bit mode, but supposedly also contains an
Alpha byte.
8:8:8:8
R:G:B:A

I say supposedly, because I think some cards just ignore the 4th byte. 
Still nice to use, though, even if the 4th byte doesn't work... a lot
easier to format :)

j.weeks

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