uses jpeg;
procedure TForm1.Button1Click(Sender: TObject);
var
bmp : TImage;
jpg : TJpegImage;
begin
bmp := TImage.Create(nil);
jpg := TJpegImage.Create;
bmp.picture.bitmap.LoadFromFile('c:\picture.bmp');
jpg.Assign( bmp.picture.bitmap );
//Here you can set the jpg object's
//properties as compression, size and more
jpg.SaveToFile('c:\picture.jpg');
jpg.Free;
bmp.Free;
end;

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