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schoolpost / PiDNG

Create Adobe DNG RAW files using Python. Works with any Bayer RAW Data including native support for Raspberry Pi cameras.
MIT License
199 stars 37 forks source link

Support for GPS tags #79

Open MadsDyrmann opened 1 year ago

MadsDyrmann commented 1 year ago

I really appreciate this library, and it functions effectively for exporting uncompressed DNGs with various tags. However, I have a camera equipped with a GPS module, and I would greatly appreciate it if it were also possible to add GPS tags to the DNG files. I am uncertain whether this is already achievable through a sub-IFD. If it is, could you kindly provide guidance on how to so so?

fwachsmuth commented 1 year ago

I'd recommend a look into exiftool for that.

MadsDyrmann commented 1 year ago

I am actually using exiftool for that, which works. But it seems like an extra step first exporting the dng file using PiDNG, then open and exporting it again using exiftool. It would be ideal, if the GPS tags could be added together with the other tags that PiDNG adds in the first place.

MadsDyrmann commented 1 year ago

I just did a test: Exporting a 12Mp image (8 bit bayer-encoded numpy array) to DNG takes ~0,015s when using PiDNG. Adding GPS data using exiftool takes additionally ~0.188s. It would therefore reduce the writing time significantly, if GPS data could be added from PiDNG.