From: "NoDuck!!!!" <info AT nospam@noduck.nl>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: drop shadow
Date: Sat, 14 Oct 2000 22:47:51 +0200
Organization: Kabelfoon B.V.
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi, thanks for your comments but:
the dial turns, so when I make a shadow by placing darkened pixels a bit to
the right or left it doesn't look natural, It's as if the lightsource turns
with the dial.....

Graham Reeds <grahamr AT dtn DOT ntl DOT com> schreef in berichtnieuws
KqnF5.32137$uq5 DOT 623358 AT news6-win DOT server DOT ntlworld DOT com...
> You could simulate a shadow by redrawing the image slightly offset to the
> original image - i.e. two or three pixels to the left or right - as a
on/off
> mask to darken the underlying image (i.e. the speedo itself).  How you
would
> do it specifically in Allegro, I don't know, but it might be as simple as
> reading in the pixel value and subtracting a fixed value off it (say 32 so
> we could use a shift) and clamp it so we don't affect any other components
> of the colour.
>
> Hope that helps.
> --
>
> Stay Lucky, Graham "Mournblade" Reeds.
> ICQ No.:  30514803
> http://homepage.dtn.ntl.com/grahamr
>
>