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The imghdr module determines the type of image contained in a
file or byte stream.
The imghdr module defines the following function:
-
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 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 |
New in version 2.5:
Exif detection.
You can extend the list of file types imghdr can recognize by
appending to this variable:
- tests
-
A list of functions performing the individual tests. Each function
takes two arguments: the byte-stream and an open file-like object.
When 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'
Release 2.5.2, documentation updated on 21th February, 2008.
See About this document... for information on suggesting changes.
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