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import time
from fractions import Fraction
from django.contrib.gis.geos import Point
import exiftool
from locations.models import Location
def readexif(image):
"""
takes an image and fills in all the exif data tracked in the image model
"""
with exiftool.ExifTool() as et:
meta = et.get_metadata(image.image.path)
et.terminate()
image.exif_raw = meta
try:
image.title = meta["EXIF:ImageDescription"]
except:
try:
image.title = meta["XMP:Title"]
except:
pass
try:
image.caption = meta["EXIF:UserComment"]
except:
pass
try:
image.exif_lens = meta["MakerNotes:LensType"]
except:
try:
image.exif_lens = meta["XMP:Lens"]
except:
pass
try:
image.point = Point(meta["XMP:GPSLongitude"], meta["XMP:GPSLatitude"], srid=4326)
try:
image.location = Location.objects.filter(geometry__contains=image.point).get()
except Location.DoesNotExist:
pass
except KeyError:
pass
try:
image.exif_aperture = meta["EXIF:FNumber"]
except:
pass
image.exif_make = meta["EXIF:Make"]
image.exif_model = meta["EXIF:Model"]
image.exif_exposure = str(Fraction(float(meta["EXIF:ExposureTime"])).limit_denominator())
image.exif_iso = meta["EXIF:ISO"]
image.exif_focal_length = meta["EXIF:FocalLength"]
fmt_date = time.strptime(meta["EXIF:DateTimeOriginal"], "%Y:%m:%d %H:%M:%S")
image.exif_date = time.strftime("%Y-%m-%d %H:%M:%S", fmt_date)
image.height = meta["File:ImageHeight"]
image.width = meta["File:ImageWidth"]
return image
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