[Image-SIG] Find camera information from JPG image

[Fredrik Lundh]

George LeCompte wrote:

> How do I recover camera information such as shtter speed, focal length
> from the header of a JPG image?

Assuming a recent version of PIL, you can use the _getexif() method on 
JPEG images to get the raw EXIF information, and use the dictionaries in 
the ExifTags module to map from EXIT codes and back (alternatively, look 
up the keys in the EXIF specification).  Example:

 >>> import Image, ExifTags
 >>> im = Image.open("im001.jpg")
 >>> im._getexif().keys()
[36864, 37121, 37122, 36867, 36868, 37381, 37510, 37383, ...
 >>> for key, value in sorted(im._getexif().items()):
...     print key, ExifTags.TAGS.get(key), value
...
271 Make Canon
272 Model Canon PowerShot A85
274 Orientation 1
282 XResolution (180, 1)
283 YResolution (180, 1)
296 ResolutionUnit 2
306 DateTime 2005:08:14 10:24:05
531 YCbCrPositioning 1
33434 ExposureTime (1, 160)
33437 FNumber (48, 10)
34665 ExifOffset 196
36864 ExifVersion 0220
36867 DateTimeOriginal 2005:08:14 10:24:05
36868 DateTimeDigitized 2005:08:14 10:24:05
...

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