Boolean option that specifies whether GIF images with more frames are animated by Imaging (according to frame disposal methods) or just raw frames are loaded and sent to user (if you want to animate GIF yourself).
ImagingGIFLoadAnimated = 56;
ImagingTypes (at line 151)
Default value is 1. Raw frames are 256 color indexed images (ifIndex8), whereas animated frames are always in 32bit ifA8R8G8B8 format (simplifies animating).