----- Original Message ----- > I have some small spots on the pictures that appear to be always at the > same area and are mainly visible on long exposures.
Try taking pictures of uniform background (e.g. clear sky), out of focus, with narrow aperture. If you see these spots more strongly in these conditions, and consistently at the same location, they're probably dust on the sensor. It's actually not that hard to remove (either pay ~ 50$ in a shop, or buy a 20$ kit and do it yourself). Your favorite search engine is your friend. > If I understand > correctly - Canon has a way to collect dust data and somehow clean these > areas (my guess is by approximating the pixels). Is there a way to do a > similar thing with DT? dt has "hot pixels" to discard and approximate _pixels_ that are way off (typically dead pixels), but a spot due to dust covers many pixels and darktable won't be able to remove that automatically. One important property of dt is that the resulting image depends only on the RAW file and the content of the database (or the xmp file), and the "dust removal by keeping an image of where dust is" doesn't fit well in this model. Obviously, you still have the « spot removal » tool, but you need to remove each spot by hand. -- Matthieu Moy http://www-verimag.imag.fr/~moy/ ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
