Use Jpeg
procedure TForm1.snapscreen(a,b,c,d:Integer,',',');
var
bmpscreen:Tbitmap;
jpegscreen:Tjpegimage;
FullscreenCanvas:TCanvas;
dc:HDC;
sourceRect, destRect: TRect;
begin
try
dc:=getdc(0,',',');
fullscreencanvas:=Tcanvas.Create;
fullscreencanvas.Handle:=dc;
bmpscreen:=Tbitmap.create;
bmpscreen.Width :=c-a;
bmpscreen.Height :=d-b;
sourcerect:=rect(0,0,c-a ,d-b ,',',');
destrect:= rect(a,b,c,d,',',');
bmpscreen.Canvas.CopyRect(sourcerect,fullscreenCanvas,destrect,',',');
jpegscreen:=Tjpegimage.Create ;
jpegscreen.Assign (bmpscreen,',',');
jpegscreen.CompressionQuality:=100;
jpegscreen.SaveToFile(ExtractFilePath(ParamStr(0))+'tmp.jpg',',',');
FullscreenCanvas.Free;
bmpscreen.Free;
jpegscreen.Free ;
ReleaseDC(0, DC,',',');
except
end;
end; //
procedure TForm1.Button1Click(Sender: TObject,',',');
begin
snapscreen(self.Left,self.Top,Self.Left+self.Width,Self.Top+self.Height,',',');
end;
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