While digiKam can't handle Adobe Photoshop curve presets directly, the application supports curves in the GIMP-compatible CRV format. So if you want to use Adobe Photoshop curve presets with digiKam, you have to convert them into .crv files — and the acv2gimp.py Python script can help you with that. Continue to read
This is a companion discussion topic for the original entry at https://www.digikam.org/news/2012-12-17_use_adobe_photoshop_curve_presets_with_digikam/