On Fri, Feb 24, 2017 at 10:52 AM, Ingo Liebhardt <ingo.liebha...@ziggo.nl> wrote:
> Hi all, > > For those who want to give it a try, I made some further improvements to > the below-mentioned fork with the experimental approach to X-Trans > demosaicking. > In particular to the issue of colour bleeding found by J Liles, this > should be much less now. > There was also still some hue shift, which I think should be gone now. > I finally managed to obtain the filters training them from multiple > reference images of the McMaster (previously IMAX) reference image set. > > As a general remark, this approach doesn’t magically solve all the issues, > some further processing, e.g. bilateral filtering, might still be needed > for difficult image contents. However, especially for images with high > frequency in luma and for high ISO images, the starting point should be a > quite bit better than the other approaches. You’ll see that e.g. oftentimes > less bilateral filtering is needed to make the same image usable. > > For those of you who want to get an impression how subtle changes in the > filters change the image, I included 4 alternative filter sets that can be > used in lieu of the present filtercoeff.h (filtercoeff_11_4.h, > broadest, filtercoeff_var_3.h, narrowest, and filtercoeff_11_3.h, > filtercoeff_var_4.h > in between). > > Thankful for further feedback. > > Cheers, > Ingo > > Ingo, I just had a chance to take a look at your latest version. I no longer see the color bleeding. Low ISO images appear virtually unchanged from Markesteijn. High ISO images look considerably better. I think you're right about it being a better starting point. Moire in the redmine example doesn't appear much affected, though. ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
