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Date Posted: 07:18:27 07/24/00 Mon
Author: Michel
Subject: Re: Problem saving PNG with transparent color (1.05beta)
In reply to: Stefan Cedervall 's message, "Problem saving PNG with transparent color (1.05beta)" on 11:05:27 07/19/00 Wed


Dear Stefan,

I apologies for the delay. I have been on vacation and was planning to continue working on

Envision, but I took the time off instead.

This seems to be ok. What type of image format (palette, true color...) are you using? Also

did you double check the that transparent color that you set is contained in your graphic?

You may also set explicitely the BackgroundColor when loading the image to double check.

Best regards,

Michel

> 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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