ShowPrewittFilterDlg example for Delphi
procedure TForm1.ShowPrewittFilterDlg1Click(Sender: TObject);
var
nRet: L_INT;
begin
LEADDlgImgEffect1.SpatialFilterType:= FLT_PREWITT_HORZ;
LEADDlgImgEffect1.DlgFlags:= DLG_PREWITTFILTER_SHOW_PREVIEW Or
DLG_PREWITTFILTER_SHOW_TOOL_ZOOMLEVEL;
LEADDlgImgEffect1.LEADImage:= LEADImage1;
nRet:= LEADDlgImgEffect1.ShowPrewittFilterDlg ( Self );
if ( nRet = SUCCESS_DLG_OK ) then
begin
LEADImage1.SpatialFilter ( LEADDlgImgEffect1.SpatialFilterType );
end;
end;