[futurebasic] Re : [FB] Colour Intensity

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From: "jonathan" <jonnnathan@...>
Date: Sun, 24 Oct 1999 13:21:26 +0200
> I am trying to control the colour intensity (roughly the same colour, 
> just lighter or darker) for drawing.
> Just taking a percentage of the RGB colour and either adding or
> subtracting doesn't seem to make the colour lighter or darker.
> Anyone done this sort of thing?

Yep, in my apps 'ShadowBox' and 'WebLoupe' - go to my home page at:
for the apps:
(I'll be mirroring this site at:
soon as officially I've closed the first account
but the provider has forgotten to kill me!)

Anyway: I converted RGB to HSV then alter the V component by the percentage
that I need... then convert back to RGB. The hardest part is moving
percentages to parts of 256 and back!

For you Mel, this'll take all of 10 minutes!

(resident unkilled color gnome)