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Date Posted: 03:31:14 12/09/03 Tue
Author: Andrew Diabo
Subject: Re: How to detect non bmp files and convert automatically to bmp grayscale in code
In reply to: Michel 's message, "Re: How to detect non bmp files and convert automatically to bmp grayscale in code" on 22:32:19 12/07/03 Sun

Hi Michel,

Thanks for taking the time to respond. I'm having a little difficulty understanding the concept, but following is my attempt to do the GuessDibGraphicClass with no success. Can you please tell me where I went wrong?

procedure TForm1.LoadFile( const FileName : String );
var
Stream: TFileStream;
DibClass: TDibGraphicClass;
begin
Stream := TFileStream.Create(FileName, fmCreate);
try
Stream.Seek(0, soFromBeginning);
DibClass := GuessDibGraphicClass(Stream);
if TDibGraphic(DibClass) is TBitmapGraphic then
Edit1.Text := 'Bitmap'
else
Edit1.Text := 'Not a Bitmap';
finally
Stream.Free;
end;
end;

Thanks
Andrew


>Hi Andrew,
>
>You can use the function EnDiGrph.GuessDibGraphicClass
>to determine the file format from the contents of the
>file. If TBitmapGraphic is not returned, then it is
>not a bitmap. You can then load the file in the
>appropriate TDibGraphic derived class, and assign it
>to a TBitmapGraphic to convert it. Then you can use
>the TImageFormatTransform to convert it to grayscale.
>
>Best regards,
>
>Michel
>

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