Peter Popov wrote in message ...
>On Wed, 29 Sep 1999 04:14:50 +0200, Remco de Korte
><rem### [at] xs4allnl> wrote:
>
>>There was a discussion in one of the groups on this server not long ago
about
>>converting rgb to grayscale values. I've been looking for that thread but
can't
>>find it. Some formulas were mentioned and I'd like to try those again.
>>
>>Houdoe!
>>
>>Remco
>
>A rough formula is:
>
>Gray = 0.30*Red + 0.59*Green + 0.11*Blue
>
>It might be 31 for red and 10 for blue but you have the idea.
>
>There is a DOS interrupt that would convert a VGA palette entry from
>rgb to grayscale. I think it is int 10,10,0b but I might be wrong (man
>was it a long ago!). If you have some info on he ints you might check
>it out, this is where I know this formula from.


The interrupt is INT 10 with AX = 101B.  The list I have doesn't have any
more information than that.

Mark

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