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POCopying and Writing EXIF information from one image to another using pyexiv2
 

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  1. POCopying and Writing EXIF information from one image to another using pyexiv2
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    <p>Am trying to copy EXIF information of a Image file to the resized version of the same image using pyexiv2. Searching for a solution i stumbled upon a post in <a href="https://stackoverflow.com/questions/400788/resize-image-in-python-without-losing-exif-data">Stack Overflow</a>. It looks like the api's used in the function is outdated and is not available in the latest version. Based on the latest document i created a function like this</p> <pre><code>def get_exif(file): """ Retrieves EXIF information from a image """ ret = {} metadata = pyexiv2.ImageMetadata(str(file)) metadata.read() info = metadata.exif_keys for key in info: data = metadata[key] ret[key] = data.raw_value return ret def write_exif(originFile, destinationFile, **kwargs): """ This function would write an exif information of an image file to another image file """ exifInformation = get_exif(originFile) metadata = pyexiv2.ImageMetadata(str(destinationFile)) for key, value in exifInformation.iteritems(): metadata[key] = value copyrightName = kwargs.get('copyright', None) if copyrightName != None: metadata['Exif.Image.Copyright'] = copyrightName try: metadata.write() except: return False else: return True </code></pre> <p>But this ends up in an error</p> <blockquote> <p>Python argument types in _ExifTag._setParentImage(_ExifTag, NoneType) did not match C++ signature: _setParentImage(exiv2wrapper::ExifTag {lvalue}, exiv2wrapper::Image {lvalue})</p> </blockquote> <p>I am now clueless on what went wrong. Could someone please help me out? Thanks</p> <h2>EDIT</h2> <p>Based on @unutbu 's suggestion I made change to data.raw_value in get_exif() method to data.value but still am facing the same issue. Am pasting more information regarding this error:</p> <pre><code>Python argument types in _ExifTag._setParentImage(_ExifTag, NoneType) did not match C++ signature: _setParentImage(exiv2wrapper::ExifTag {lvalue}, exiv2wrapper::Image {lvalue}) Request Method: POST Request URL: http://localhost:8000/accounts/photography/ Django Version: 1.3.1 Exception Type: ArgumentError Exception Value: Python argument types in _ExifTag._setParentImage(_ExifTag, NoneType) did not match C++ signature: _setParentImage(exiv2wrapper::ExifTag {lvalue}, exiv2wrapper::Image {lvalue}) Exception Location: /usr/lib64/python2.7/site-packages/pyexiv2/exif.py in _set_owner, line 107 **Traceback** /usr/local/lib/python2.7/site-packages/django/core/handlers/base.py in get_response response = callback(request, *callback_args, **callback_kwargs) ... /usr/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py in _wrapped_view return view_func(request, *args, **kwargs) ... /home/swaroop/public_html/xyz/xyz/apps/photography/views.py in accountsPhotoList write_exif(originFile=filePath, destinationFile=output) ... /home/swaroop/public_html/xyz/xyz/library/imageManipulation.py in write_exif metadata[key] = value ... /usr/lib64/python2.7/site-packages/pyexiv2/metadata.py in __setitem__ return getattr(self, '_set_%s_tag' % family)(key, tag_or_value) ... /usr/lib64/python2.7/site-packages/pyexiv2/metadata.py in _set_exif_tag tag._set_owner(self) ... /usr/lib64/python2.7/site-packages/pyexiv2/exif.py in _set_owner self._tag._setParentImage(metadata._image) ... Python Executable: /usr/bin/python2.7 Python Version: 2.7.2 </code></pre>
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    1. COWell figured out that metadata.read() should be added to write_exif. Hope this would help someone who too faced similar issue
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