imagejpeg corrupted output

Question

I'm stuck at a weird problem regarding imagepng() and similiar.

Whatever I do, the output is disliked by my browser (and my desktop programs) and the image is considered corrupted.

I've so far tried

header('Content-Type: image/png');
imagepng(imagecreatefrompng($str_file_path));
exit;

and

header('Content-Type: image/png');
echo file_get_contents($str_file_path, TRUE);exit;

Both gives data which looks like actual image data. Neither should have any blank space since header() doesn't complain and I exit; the script afterwards.

There are no errors given which would ruin the output either.
The functions are there, obviously. So what seems to be the problem?

I couldn't find any question answering this either.

The output I get:

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Answer 1

All credits to @Frits for his comment

Basicly I had the file saved as UTF-8 when I instead should have had it as UTF-8 without BOM. Changing this solved the problem perfectly.