PHP version
GD		Elgg requires the GD extension to be loaded
IMagick PHP extension
exec()		Required for ImageMagick command line
Memory Available to PHP		Change memory_limit to increase
Memory Used to Load This Page		This is approximately the minimum per page
Max File Upload Size		Max size of an uploaded image
Max Post Size		Max post size = sum of images + html form
Max Input Time	s	Time script waits for upload to finish
Max Execution Time	s	Max time a script will run
GD imagejpeg
GD imagepng
GD imagegif
EXIF