Determine the type of an image using Python (imghdr)

The imghdr module in Python's standard library determines the type of image contained in a file or byte stream. There is only one function defined in imghdr module

imghdr.what(filename, h=None):

This function tests the image data contained in the file and returns a string describing the image type. The function also accepts h parameter. If given the filename is ignored and h is treated as the byte stream to test.

The imghdr module recognizes the following image types

Example

>>> import imghdr
>>> imghdr.what('bass.gif')
'gif'
>>> imghdr.what('polar.png')
'png'
>>> imghdr.what('test.jpg')
'jpeg'