Thanks for the relevant doco link. So it sounds like I was deluded in thinking I was altering R, G, B levels independently with the histogram.
If I get time I might have a look at contributing some code. (I have also been wanting to add a loupe to lighttable.) Russell On 2013-02-04 08:27, johannes hanika wrote: > On Mon, Feb 4, 2013 at 9:57 AM, Russell Edwards <[email protected]> > wrote: >> Hi, >> >> I have some digital photos of faded old colour prints. The R, G, B >> histograms are squashed and shifted with respect to eachother due to >> the >> different fading characteristics of the different pigments in the >> paper. >> >> It seems to me the best way to fix what I am seeing would be if I >> could >> apply the exposure or levels module to the R, G, B modules >> independently. >> >> What's the closest feature in darktable to achieve such a thing? >> >> I can kind of do it dragging the histogram but that is extremely >> slow >> and jerky, and I can't find which module actually implements that >> processing, nor documentation of it, so am hesitant to use it. > > http://www.darktable.org/usermanual/ch03s04s05.html.php#idp619488 > >> I can partly do what I need by playing with channel mixer or color >> correction, but it is not flexible enough to really do what I need >> to >> do, which to first order is move the left end of the red histogram >> to >> the left and the right end of the red histogram to the right. >> >> Thanks in advance for any help you can offer. >> >> Russell >> >> >> >> ------------------------------------------------------------------------------ >> Everyone hates slow websites. So do we. >> Make your web apps faster with AppDynamics >> Download AppDynamics Lite for free today: >> http://p.sf.net/sfu/appdyn_d2d_jan >> _______________________________________________ >> Darktable-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/darktable-users ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
