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+
+:mod:`imghdr` --- Determine the type of an image
+================================================
+
+.. module:: imghdr
+ :synopsis: Determine the type of image contained in a file or byte stream.
+
+
+The :mod:`imghdr` module determines the type of image contained in a file or
+byte stream.
+
+The :mod:`imghdr` module defines the following function:
+
+
+.. function:: what(filename[, h])
+
+ Tests the image data contained in the file named by *filename*, and returns a
+ string describing the image type. If optional *h* is provided, the *filename*
+ is ignored and *h* is assumed to contain the byte stream to test.
+
+The following image types are recognized, as listed below with the return value
+from :func:`what`:
+
++------------+-----------------------------------+
+| Value | Image format |
++============+===================================+
+| ``'rgb'`` | SGI ImgLib Files |
++------------+-----------------------------------+
+| ``'gif'`` | GIF 87a and 89a Files |
++------------+-----------------------------------+
+| ``'pbm'`` | Portable Bitmap Files |
++------------+-----------------------------------+
+| ``'pgm'`` | Portable Graymap Files |
++------------+-----------------------------------+
+| ``'ppm'`` | Portable Pixmap Files |
++------------+-----------------------------------+
+| ``'tiff'`` | TIFF Files |
++------------+-----------------------------------+
+| ``'rast'`` | Sun Raster Files |
++------------+-----------------------------------+
+| ``'xbm'`` | X Bitmap Files |
++------------+-----------------------------------+
+| ``'jpeg'`` | JPEG data in JFIF or Exif formats |
++------------+-----------------------------------+
+| ``'bmp'`` | BMP files |
++------------+-----------------------------------+
+| ``'png'`` | Portable Network Graphics |
++------------+-----------------------------------+
+
+.. versionadded:: 2.5
+ Exif detection.
+
+You can extend the list of file types :mod:`imghdr` can recognize by appending
+to this variable:
+
+
+.. data:: tests
+
+ A list of functions performing the individual tests. Each function takes two
+ arguments: the byte-stream and an open file-like object. When :func:`what` is
+ called with a byte-stream, the file-like object will be ``None``.
+
+ The test function should return a string describing the image type if the test
+ succeeded, or ``None`` if it failed.
+
+Example::
+
+ >>> import imghdr
+ >>> imghdr.what('/tmp/bass.gif')
+ 'gif'
+