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Date Posted: 11:05:27 07/19/00 Wed
Author: Stefan Cedervall
Subject: Problem saving PNG with transparent color (1.05beta)

My PNG:s does not seem to be transparent.

What I do is:

png := TPngGraphic.Create;
png.Assign(Picture.Graphic);
png.SaveProgressive := True;
png.SaveTransparent := True;
png.TransparentColor := ColorToTRGB(TransparentColor);
png.SaveToFile(TargetLink);

The file is saved OK, but without transparent
color. I find no docs on ´1.05beta, including
the SaveTransparent, so I migt do somthing realy
silly ;-). Think a have checked the obvius thou,
like traying with png.SaveProgressive := False;

ColorToTRGB is writen in a way so the switch of
order shuld not matter:

function ColorToTRGB(Color: TColor): EnDiGrph.TRgb;
var
rgbValue: Longint; // RGB;
begin
rgbValue := ColorToRGB(Color); // Graphics.pas
Result.Red := GetRValue(rgbValue); // Windows.pas
Result.Green := GetGValue(rgbValue); // Windows.pas
Result.Blue := GetBValue(rgbValue); // Windows.pas
end;

And TransparentColor is the right color, for if I use
it to save to gif, it works!

TIA /S

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