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Date Posted: 06:48:43 06/14/00 Wed
Author: Michel
Subject: Re: Colour Depth Conversion
In reply to: Bob Villiers 's message, "Re: Colour Depth Conversion" on 14:30:34 06/13/00 Tue


Hi Bob,

The "Envision" way to do this would be to use the TImageFormatTransform. For example,

Graphic := TBitmapGraphic.Create;
Transform := TImageFormatTransform.Create;

Graphic.AssignFromDibHandle(DibHandle);
Transform.ImageFormat := ifColor16;
Transform.Apply(Graphic);

...

Transform.Free;
Graphic.Free;


Best regards,

Michel

> The message has now changed. Is there a simpler (more
> elegant) solution than below <g>.
>
> Bob
>
> bmpGraphic := TBitmapGraphic.Create;
> try
>
> bmpGraphic.AssignFromDibHandle(DibHandle);
> st:= TMemoryStream.Create;
> try
> bmpGraphic.SaveToStream(st);
> bmp:= TBitmap.Create;
> try
> st.seek(0,0);
> bmp.LoadFromStream(st);
> bmp.PixelFormat:= pf4bit;
> // Clear memory stream
> st.Clear;
> bmp.SaveToStream(st);
> // Clear tempory graphic
> bmpGraphic.Clear;
> st.seek(0,0);
> bmpGraphic.LoadFromStream(st);
>
> Graphic := TPngGraphic.Create;
> try
> Graphic.Assign(bmpGraphic);
> Graphic.XDotsPerInch := XDpi;
> Graphic.YDotsPerInch := YDpi;
>
> Graphic.SaveToFile(string(CallBackData));
> finally
> Graphic.Free;
> end;
> finally
> bmp.Free;
> end;
> finally
> st.Free;
> end;
> finally
> bmpGraphic.Free;
> end;
> end;

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