Hi, I've read a few times that it's better to use the HSV-based blending modes with profiled denoise (the latest article is a review of the Open Source Photography Course by houz, one of dt's developers, so I guess he knows what he's speaking about). I've tried those HSV-based modes a couple of times, and I always felt they made things worse. I'm not a fan of luma denoise, I prefer grain over smoothing artefacts (of course that's a personal thing), so I'll be showing an example of chroma-only denoise below (I did try luma as well, non-local means, patch size 1 and also 4, strength 0.2, both in lightness and HSV-lightness mode, and *my* preference was (best to worst) no luma - lightness - HSV lightness). I was just wondering how many of you agree (with regards to HSV vs. 'plain' blending - the choice of whether to filter luma and how much is a different, equally subjective question). You'll find an example here: http://tech.kovacs-telekes.org/files/dt_profiled_denoise_colour_vs_hsv_colour/ Even when fit to the screen (1920x1080), I find the plain 'colour'-blended version (DSC_8834.jpg) less noisy *and* sharper than the HSV-colour-blended one (DSC_8834_01.jpg). Zoomed in, the noise seems more 'patterned' on the HSV-blended version (shows some kinds of structure, patches, homogeneous areas with more defined, thicker borders). I did not try to tweak the parameters of the noise reduction, I simply switched between colour and HSV colour. Perhaps that's a mistake? Also, note the difference of the lightness of the sweater near the left edge - should that not stay constant, since we're merging colours only?
dt 1.6.8 from PPA. Thanks, Kofa ------------------------------------------------------------------------------ _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
