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# -*- coding: utf-8 -*-
# Copyright 2007-2024 The HyperSpy developers
#
# This file is part of RosettaSciIO.
#
# RosettaSciIO is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# RosettaSciIO is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with RosettaSciIO. If not, see <https://www.gnu.org/licenses/#GPL>.
from PIL.ExifTags import TAGS
CustomTAGS = {
**TAGS,
# Customized EXIF TAGS from Renishaw
0xFEA0: "FocalPlaneXYOrigins", # 65184
0xFEA1: "FieldOfViewXY", # 65185
0xFEA2: "Unknown", # 65186, could it be magnification?
}
# from https://exiftool.org/TagNames/EXIF.html
# For tag 0x9210 (37392)
FocalPlaneResolutionUnit_mapping = {
None: None,
1: None,
2: "inches",
3: "cm",
4: "mm",
5: "µm",
}
def _parse_axes_from_metadata(exif_tags, sizes):
# return of axes must not be empty, or dimensions are lost
# if no exif_tags exist, axes are set to a scale of 1 per pixel,
# unit is set to None, hyperspy will parse it as a traits.api.undefined value
offsets = [0, 0]
fields_of_views = [sizes[1], sizes[0]]
unit = None
if exif_tags is not None:
# Fallback to default value when tag not available
offsets = exif_tags.get("FocalPlaneXYOrigins", offsets)
# jpg files made with Renishaw have this tag
fields_of_views[0] = exif_tags.get("FocalPlaneXResolution", fields_of_views[0])
fields_of_views[1] = exif_tags.get("FocalPlaneYResolution", fields_of_views[1])
unit = FocalPlaneResolutionUnit_mapping[
exif_tags.get("FocalPlaneResolutionUnit", unit)
]
axes = [
{
"name": name,
"units": unit,
"size": size,
"scale": fields_of_views[i] / size,
"offset": offsets[i],
"index_in_array": i,
}
for i, name, size in zip([1, 0], ["y", "x"], sizes)
]
return axes
def _parse_exif_tags(im):
"""
Parse exif tags from a pillow image
Parameters
----------
im : :class:`PIL.Image`
The pillow image from which the exif tags will be parsed.
Returns
-------
exif_dict : None or dict
The dictionary of exif tags.
"""
exif_dict = None
try:
# missing header keys when Pillow >= 8.2.0 -> does not flatten IFD anymore
# see https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#image-getexif-exif-and-gps-ifd
# Use fall-back _getexif method instead
# Not all format plugin have the private method
# prefer to use that method as it returns more items
exif_dict = im._getexif()
except AttributeError:
exif_dict = im.getexif()
if exif_dict is not None:
exif_dict = {CustomTAGS.get(k, "unknown"): v for k, v in exif_dict.items()}
return exif_dict
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