# Composite colors...

Hi all

Colors:
-------
Light yellow = \$0080FFFF. When I use FloodFill on a Canvas, and read the colors of each pixel, it is a mixture: ie White \$00FFFFFF and Yellow \$0000FFFF.

Question:
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How do I form a composite color if I know the 2 main colors, and vice versa?

Regards
Keith
LVL 1
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Commented:
comp := (first_col + second_col)div 2;

or

var
fr,fg,fb,sr,sg,sb,cr,cg,cb : byte;
begin
fr := first_col;
fg := first_col shr 8;
fb := first_col shr 16;
sr := second_col;
sg := second_col shr 8;
sb := second_col shr 16;

if (fb+sb) >= 512 then
cb := 255
else
cb := (fb+sb)div 2;
if (fg+sg) >= 512 then
cg := 255
else
cb := (fg+sg)div 2;
if (fr+sr) >= 512 then
cr := 255
else
cr := (fr+sr)div 2;

comp_col := cr+(cg shl 8)+(cb shl 16);

Or something like that :)
GL
Mike

0

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Author Commented:
Thanks

I have posted another question about composite colors...

Keith
0
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