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Date Posted: 10:40:24 05/08/01 Tue
Author: wto
Subject: Re: Transparent PNG
In reply to: Michel 's message, "Re: Transparent PNG" on 18:35:34 05/07/01 Mon

But sometime it is impossible to determined whether
the picture to be loaded is a TPNGGraphic until the
TPicture.LoadFromFile is called.

>It not possible to check if the PNG image is
>transparent. Although, you can specify a background
>color and it will be used if the png file is
>For example,
> Graphic : TPngGraphic;
> Graphic := TPngGraphic.Create;
> { put a TPngGraphic in an Image component }
> Image.Picture.Graphic := Graphic;
> Graphic.Free;
> Graphic := Image.Picture.Graphic as TPngGraphic;
> { force a white background }
> Graphic.OverwriteFileBackground := True;
> Graphic.BackgroundColor := MakeRGB(255,255,255);
> Graphic.LoadFromFile(...);
>Best regards,
>>I registered PNG format to TPicture and use
>>TPicture.LoadFromFile to load the PNG file.
>>(Because I need to process some other formats, I let
>>the TPicture to find the proper
>>TGraphic Class by file extension.) Moreover, I want to
>>know whether the loaded PNG is
>>transparent and if it is, I want set its background
>>color to clWhite. What should I do?

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