pil example test exif (snippet)

Python pil example 'test exif'

Functions in program:

• def test_exifread():
• def test_piexif_use():
• def test_piexif_inspect():
• def test_piexif():
• def test_PIL():
• def test_IPTC():

python test exif

Python pil example: test exif

"""
    test_exif.py

    This module tests various third-party libraries for their ability to extract
    metadata from a test JPG file.

    Python 3.4 used on Windows 10.

    This code accompanies the article:
        http://www.theatreofnoise.com/2016/10/how-to-retrieve-photo-metadata-in-python.html
"""

fn = 'path/to/some/file/tester.jpg'

def test_IPTC():
    """
        tried to install from:
        https://pypi.python.org/pypi/IPTCInfo/

        not Python 3 compatible, so this function is just for show
    """
    from iptcinfo import iptcinfo
    print( '\n<< Test of iptcinfo >>\n' )

    print(iptcinfo.__dict__)
    iptc = iptcinfo.IPTCInfo(fn)

    image_title = iptc.data.get('object name', '') or iptc.data.get('headline', '')
    image_description = iptc.data.get('caption/abstract', '')
    image_tags = iptc.keywords

def test_PIL():
    """
        Pillow:
        https://pillow.readthedocs.io/en/3.4.x/index.html
    """
    from PIL import Image
    from PIL.ExifTags import TAGS
    print( '\n<< Test of PIL>> \n' )

    img = Image.open(fn)
    info = img._getexif()
    for k, v in info.items():
        nice = TAGS.get(k, k)
        print( '%s (%s) = %s' % (nice, k, v) )

def test_piexif():
    """
        Piexif
        http://piexif.readthedocs.io
    """
    import piexif
    print( '\n<< Test of Piexif >>' )

    data = piexif.load(fn)
    # returns several dictionaries, plus a byte dump as 'thumbnail'
    for key in ['Exif', '0th', '1st', 'GPS', 'Interop']:
        subdata = data[key]
        print( '\n%s:' % key )
        for k, v in subdata.items():
            print( '%s = %s' % (k, v) )

def test_piexif_inspect():
    """
        Examines mappings of data codes to names.
    """
    import piexif
    print( '\n<< Inspect piexif >>\n' )

    info = piexif.ImageIFD.__dict__
    l = ['%s = %s' % (v, k) for k, v in info.items()]
    l.sort()
    for item in l:
        print(item)

def test_piexif_use():
    """
        Since the above mapping does NOT have a name for the
        comment field, this is how I would need to extract it.
    """
    import piexif
    print( '\n<< Usage of piexif >>' )
    data = piexif.load(fn)
    exif = data['Exif']
    comment = exif.get(37510, '').decode('UTF-8')
    comment = comment[8:]
    print( comment )

def test_exifread():
    """
        exifread:
            https://github.com/ianare/exif-py

        Note: does not write tags.
    """
    import exifread
    print( '\n<< Test of exifread >>\n' )

    with open(fn, 'rb') as f:
        exif = exifread.process_file(f)

    for k in sorted(exif.keys()):
        # omit keys with binary data
        if k not in ['JPEGThumbnail', 'TIFFThumbnail', 'Filename', 'EXIF MakerNote']:
            print( '%s = %s' % (k, exif[k]) )

if __name__ == '__main__':
    test_PIL()
    test_piexif()
    test_exifread()

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