I'm trying to use darktable-cli to postprocess hundreds of thousands of raw (DNG) images quickly into JPGs for structure-from-motion imagery. In short - optimizing levels makes our image-matching algorithms work better, so much so that a well-adjusted set of JPGs will work better than the raw or DNG imagery. But I don't have time to individually adjust images - this needs to be an automated routine.
I can use Capture One with auto-levels to get great results, but would prefer to do it in darktable for reproducibility and documentability and scriptability and because I'm totally falling for darktable and the principles it's built on the more I use it (still very much an amateur). BUT I've been trying to automatically apply levels/rgb levels/filmic using XMP files or styles with darktable-cli and getting funky results. It looked like if I reference a single XMP that I adjusted with rgb levels/auto or filmic/auto then it's only applying the auto-adjustment as per that specific photo. I can tell because if I move to a photo with a different range, the adjustment doesn't fully stretch the levels like a manual export does. I think I'm getting better results with calling a style file with rgb levels/auto (need to experiment building a style file from light and dark images to be sure), but the same method using levels doesn't appear to work at all. Is there a "best" way to do this with darktable-cli, where I can auto-applu levels, rgb-levels, or filmic and apply a per-photo "auto" setting along with the particular method of preserving chromaticity etc? /Andy ==================================== Andy Ritchie U.S. Geological Survey Pacific Coastal and Marine Science Center 2885 Mission St. Santa Cruz, CA 95060 Office (831) 460-7454 Cell (360) 460-9453 [email protected]<mailto:[email protected]> --------------------------------------------------------------- ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
