defaults to FALSE for continuity with existing uses of the module. Enables user to bypass the default stripping of unsupported tags for use in applications in which other services perform anonymization.

introduce function _get_string_representation() which returns the string representation of a data element with proper error handling, and simplify definition of the _keyword_to_copy list based on whether keep_all_tags is True

…n whether the `keep_all_tags` parameter is True. Remove overwrite of _keyword_to_copy, Also make sure to copy out keys in case that image is RGB and keep_all_tags is True

…han keywords (resolves edge case in which a keyword is missing in the image with the tag present). Resolved issue of reusing variable.

When keep_all_tags is true, the tags still need to be copied from img to out when calling srgb2gray. This is now resolved.