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Date Posted: 17:27:50 09/19/00 Tue
Author: Michel
Subject: Re: Inserting a watermark
In reply to: Todd Cary 's message, "Re: Inserting a watermark" on 19:13:35 09/18/00 Mon

Hi Todd,

Copying an image transparently over another one will be more complicated. There is currently no built in code to do this with Envision. Using Canvas.Draw will not work. To draw transparent text is quite easy, you can see an example of it in the EnDiGrph.Pas unit, in the TDibGraphic.Draw method, in the section delimited by the __Evaluation conditional.

Drawing an image over another one transparently can be done relatively easily by using the RGB property of the TDibGraphic class. You will need to assign each pixel individual, but skip the pixels which have a transparent color in your source image.

This is a simplified example (you will need to work out the coordinates):

for X := {left} to {right}
for Y := {top} to {bottom} do
if Source.RGB[X,Y] is an opaque pixel then
Dest.Rgb[OffsetX+X,OffsetY+Y] := Source.Rgb[X,Y];

Best regards,


> OK! That works like a champ! Now I have the
> transparency issue. Are gif images the only ones with
> transparency? Can a jpeg be given transparency? Can
> a gif image be combined with a jpeg?
> Todd

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