On 3 Aug 99, at 2:02, Uzi Paz wrote:

> I guess that in 24bit color graphics:
> 8 bits are telling me the strength/luminosity of the blue color,
> 8 bits are telling me the strength/luminosity of the red color,
> 8 bits are telling me the strength/luminosity of the yellow (or green)
> color.
>
> 1) Am I right?

  Strength, I'd say, as a general "layman's" term.  Luminosity has a very
specific meaning, like hue and saturation, and whether that is exactly what
is being specified is less certain.

> 2) Green or Yellow?

  Green.  It's yellow when you're mixing pigments, green when mixing lights.
[No, I can't explain why that is.]

> 3) If I am right then how this goes with 16 or 32bit color? 32 and 16 are
> not a multiplicity of 3.

  16-bit coulour typically uses 5 bits each of red/green/blue (that's 15
total), luse one for "intensity".
  32-bit colour is generally 8 bits each of red/green/blue (that's 24 --
that's about as fine a gradation of colours as the human eye can
distinguish), but pixels are aligned on 32-bit boundaries rather than 24-bit
boundaries -- this greatly simplifies I/O between CPU and video buffer,
improving performance of the video subsystem.


David G

                         PCBUILD's List Owner's:
                      Bob Wright<[log in to unmask]>
                       Drew Dunn<[log in to unmask]>