MadsDyrmann

I think you confuse the two formats. PNG is always lossless, whereas TIFF _can be_ lossless, but often isn't. -- It depends on which compression method you select when exporting...

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...

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...