Pedro Côrte-Real schrieb am 30.12.2014 um 13:15: > On Tue, Dec 30, 2014 at 11:02 AM, Bernhard > <[email protected]> wrote: >> that's not an option for me since I want to digitize my archive only once >> and keep ALL information the scanner deliveres for potential future use and >> improvement of the results. >> And negatives seem to be very sensitive to scratches :-( . > That would be an argument for keeping the IR channel. How can it be > used in processing to get rid of scratches? Ed Hamrick proposes to use Vuescan to "scan from file" (Vuescan reads the raw file produced in the first step instead of reading from the scanner) which is much faster, does not touch the original and you can test the different settings for scratch removal, grain reduction, color recovery etc. very fast to use the best settings for the image you work on. This, off course, I will only do for those images I really like or need for some purpose. All the others get "rough treatment": Invert, Base curve, White Balance, exposure. Then they will be tagged and rated ... in case I need them later. >> Tim Gray explains the different options of "RAW scanning" in Vuescan here >> http://www.rangefinderforum.com/forums/showpost.php?p=1843660&postcount=2 >> and he also comes to the conclusion we worked out here: > So are you now going to produce RGBI TIFF files? Yes > Do those work in darktable? yes, the RGB channels can be viewed correctly, the image can be inverted by the corresponding module, WB can be set, and any other option mentioned above can be used like with a normal TIF or RAW image. Example file: http://www.bilddateien.de/transfer/files/1995_01FM28.tif > They do seem like the most sensible option.
> Is there any software out there capable of using the RGBI data to cleanup > scratches? At this moment I don't know any, but I think as IR is something like an alpha channel one should be able to produce a mask from it and perhaps restrict cloning to the really affected areas in manual post editing. But this is just an idea, I did not test this in real life till now. -- regards Bernhard http://www.bilddateien.de ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
