On jeudi 21 février 2019 14:09:53 CET fht233 wrote: > Hi, first of all I have to say that it is a great software and I like a > lot. (... long explanation about how any module works) > > Maybe it was already discussed or it is not a good idea But I think that a > clear and understable setting would be easier than having to perform all > the investigation and setting up things by yourself when you are not yet > familiar with the software and the terms. Googling and finding 'activate > the setting' would be easier than having to learn to set up the preset by > yourself, IMHO.
The lens correction module works like almost any other module (exceptions are modules that are absolutely needed for raw files, like demosaic). I found the darktable documentation very complete, not only the manual, but also the other info accessible through the Darktable web site. Presets are described in section 8.5, btw. As in most programs, changed automatic presets are only applied to newly imported items. Good thing too, as (with Darktable) you might want to change the presets when you change camera (body/brand/lens/...). In your case, say you decide to change one of your lenses for a newer model, with *different* distorsion parameters. Do you really want that autoapplied to older images? There is another catch with the lens correction module, related to the way lenses are identified. The lens identification in the metadata is based on an ID value provided by the lens. This value is NOT unique between brands, so a given value can refer to several lenses. Also, cameras don't necessarily know all ID values possible (esp. for 3rd party lenses), which means the lens identification is uncertain. Then there is the possibility of extender rings, focal multipliers, converters, ... Darktable/Lensfun just have no way to figure out which lens you have used beyond the image metadata... In my case (mostly 3rd party lenses), I have to specify the lens used 'by hand', and in most cases distortion correction is just not needed. So I don't need that module activated by default. Remco ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
