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Extract metadata from Canon CR2 and Nikon NEF raw files
#!/usr/bin/env python
import sys
import os
from rawphoto.cr2 import Cr2
from rawphoto.nef import Nef
def print_entries(raw, ifd, level=1):
for name in ifd.entries:
e = ifd.entries[name]
if name in ifd.subifds or isinstance(name, tuple):
if isinstance(name, tuple):
for n in name:
print(level * "\t" + n + ":")
print_entries(raw, ifd.subifds[n], level + 1)
else:
print(level * "\t" + name + ":")
print_entries(raw, ifd.subifds[name], level + 1)
else:
if isinstance(name, str):
if e.tag_type_key is 0x07:
print(level * "\t" + "{}: {}".format(
name,
"[Binary blob]"
))
else:
print(level * "\t" + "{}: {}".format(
name,
ifd.get_value(e)
))
metadata = {}
filepath = sys.argv[1]
(filepath_no_ext, ext) = os.path.splitext(filepath)
filename_no_ext = os.path.basename(filepath_no_ext)
ext = ext.upper()
if ext == '.CR2':
raw = Cr2(filename=filepath)
elif ext == '.NEF':
raw = Nef(filename=filepath)
else:
raise TypeError("Format not supported")
for i in range(len(raw.ifds)):
ifd = raw.ifds[i]
print("IFD #{}".format(i))
print_entries(raw, ifd)
# Hax.
for subifd in ifd.subifds:
if isinstance(subifd, int):
print("Subifd ", subifd)
print_entries(raw, ifd.subifds[subifd], 1)
with open(filename_no_ext + "_thumb.jpg", "wb") as outfile:
try:
outfile.write(raw.thumbnail_image)
print("Wrote {}_thumb.jpg to disk...".format(filename_no_ext))
except:
pass
with open(filename_no_ext + "_preview.jpg", "wb") as outfile:
try:
outfile.write(raw.preview_image)
print("Wrote {}_preview.jpg to disk...".format(filename_no_ext))
except:
pass
with open(filename_no_ext + "_uncompressed.jpg", "wb") as outfile:
try:
outfile.write(raw.uncompressed_full_size_image)
print("Wrote {}_uncompressed.jpg to disk...".format(filename_no_ext))
except:
pass
with open(filename_no_ext + "_raw.data", "wb") as outfile:
outfile.write(raw.raw_data)
print("Wrote {}_raw.data to disk...".format(filename_no_ext))
raw.close()
@huwilerb

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@huwilerb huwilerb commented Feb 22, 2021

Hi ! I try to get the exposure time of my pictures with your code but I got 1004 instead of 90.2 s. Any Idea about where this difference come from ?
Cheers

@SamWhited

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Owner Author

@SamWhited SamWhited commented Feb 22, 2021

Sorry, I haven't looked at this in years and we no longer maintain rawkit, so I'm afraid it's not something I can help with.

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