First of all thank you very much for such a wonderful class. Though I am facing one problem with it. The thing is that I am trying to make the class return me the generated animated PNG instead of writing it to a file. So, I just commented all the functions with files, created the $output variable and concatinated all the $out variables to $output at the locations where you use fwrite. At the end I just return the image. Then I set the required header in my script like:
The animation works but somehow empty frame appears and I do not know where it comes from. I checked all the frames I provide to the class - they are all fine when used separately. But if I add more than 1 frame it starts blinking again.
you can find the example here http://preloaders.net/blinking.png .
I modified your file as follows: preloaders.net/class_sample.txt (lines 174, 175, 176, 194, 195, 248, 249 and 256)