The dt equalizer is using Fourier Transform as is the Gimp process .... you may need to understand how it works to get a reasonable result rather than relying on 'pushing-a-button' and expecting results.
On 08/31/2018 01:26 PM, ternaryd wrote: > On Fri, 31 Aug 2018 15:27:53 -0400 > Michael <[email protected]> wrote: > >> follow the thread? >> https://www.dpreview.com/forums/post/60637838 > I hadn't, but did now. There is a second > suggestion with denoise non-local means, which > I also tried unsuccessfully. > > I believe that those solutions are for a > different problem: in my case, one pixel of the > original image yields about 8x8 pixels in the > photo, producing rather high contrast stripes. > > But the photograph reproduces each original > pixel perfectly shaped; there is no sensor > noise. The camera just did perfectly what it is > supposed to do. The screening is in the > original. The moiré is not visible in a 1:1 > view. But looking at the original image, the > stripes are invisibly small; it looks just like > a plain color (with a subtle gradient). > > The Gimp plug-in descreen works in the > frequency domain by means of a fourier > decomposition. I think, darktable has means to > do this too, but I don't know how or if the > pixel patches aren't simply too large. > > BTW, I didn't try the Gimp plug-in, as I wasn't > able to install that (the plug-in repository is > down, and the files I found elsewhere wouldn't > work in gimp 2.10). > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to [email protected] > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
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Description: application/pgp-keys
