Can’t display image in jpg format

[eluser]Wangringring[/eluser]
When I use this code Out of the CI.(Normal PHP without any framework) It's work properly !!

Code:

header("Cache-control: private");
header("Content-Type: image/jpg");
header("Content-Disposition: inline ;filename=arnon.jpg");
$fn=fopen("images/arnon.jpg","r");
fpassthru($fn);

I don't know why. It seems "fpassthru" didn't work in my CI.
When I use this code without CI, it returns My photo correctly.
But in CI returns Blank page and No any error occured.