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Exiv2 / exiv2

Image metadata library and tools
http://www.exiv2.org/
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FR: report Roll Angle #1334

Open trougnouf opened 3 years ago

trougnouf commented 3 years ago

Modern cameras have a digital meter which should be used to store the angle in EXIF data. This data could be used by development software to auto-rotate the pictures (eg this FR: https://github.com/darktable-org/darktable/issues/6423 )

Can the Roll Angle be added to the tags reported by exiv2 ? This would be the first step to implement such a feature in darktable.

It is shown by exiftool for some cameras such as the Nikon D850 and D500 (samples on https://raw.pixls.us/#repo ), and documented in https://exiftool.org/TagNames/Pentax.html and https://exiftool.org/TagNames/Nikon.html

I am trying to extract the tag information from my Fujifilm X-T1 and soon in a Nikon Z6

clanmills commented 3 years ago

I'll investigate this. It's probably stored in the MakerNote and can be added. Can you:

1) Find the URL of an image that contains the data. 2) Use exiftool to show me the data you'll like Exiv2 to reveal.

trougnouf commented 3 years ago

Thank you @clanmills ! Below are a few samples:

https://raw.pixls.us/getfile.php/1835/nice/Nikon%20-%20D850%20-%2012bit%20compressed%20(Lossless)%20(3:2).NEF Roll Angle : 0.5

https://raw.pixls.us/getfile.php/2504/nice/Nikon%20-%20D500%20-%2012bit%20compressed%20(Lossy%20(type%202))%20(3:2).NEF Roll Angle : -1.8

https://raw.pixls.us/getfile.php/830/nice/Pentax%20-%20K-x%20-%2012bit%20(3:2).DNG https://raw.pixls.us/getfile.php/830/nice/Pentax%20-%20K-x%20-%2012bit%20(3:2).PEF Roll Angle : -45

https://raw.pixls.us/getfile.php/828/nice/Pentax%20-%20K-7%20-%2012bit%20(3:2).PEF Roll Angle : 0