imghdr — Determine the type of an image - Python 3.12.0a3 documentation 编辑
Source code: Lib/imghdr.py
Deprecated since version 3.11, will be removed in version 3.13: The imghdr
module is deprecated (see PEP 594 for details and alternatives).
The imghdr
module determines the type of image contained in a file or byte stream.
The imghdr
module defines the following function:
- imghdr.what(file, h=None)
Test the image data contained in the file named file and return a string describing the image type. If h is provided, the file argument is ignored and h is assumed to contain the byte stream to test.
Changed in version 3.6: Accepts a path-like object.
The following image types are recognized, as listed below with the return value from what()
:
Value | Image format |
---|---|
| SGI ImgLib Files |
| GIF 87a and 89a Files |
| Portable Bitmap Files |
| Portable Graymap Files |
| Portable Pixmap Files |
| TIFF Files |
| Sun Raster Files |
| X Bitmap Files |
| JPEG data in JFIF or Exif formats |
| BMP files |
| Portable Network Graphics |
| WebP files |
| OpenEXR Files |
New in version 3.5: The exr and webp formats were added.
You can extend the list of file types imghdr
can recognize by appending to this variable:
- imghdr.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 beNone
.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('bass.gif') 'gif'
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