I find a little problem:
I upload a PNG image, and I have Enable the on-the-fly image protection to protect the image with a PNG watermark.
The watermark.php works well with all the formats, but with PNG small or big, didn't display the image.
On the field examples
Site working with ImageMagick
FileSize: 1123.6 kb
FileSize: 77.6 kb
If I disable the on-the-fly watermark the image will show up normally. So the problem is not the size is the .png extension.
Hope you can give me some clue. Thanks in advance and Merry Xmas!!!