when you mean "profile" do you mean Raw or Jpeg? If Raw, which converter? Edmund On Wed, Jul 18, 2012 at 11:24 PM, Alberto Ferrante < alberto.ferrante@xxxxxxxxxx> wrote: > Hi all, > I am trying to build a camera profile for a Canon 5D MKIII and it is > proving to be much harder than with the other cameras that I profiled in > the past. I am working on a profile to be used with Ufraw. > For the other cameras I was using a non-linear profile (gamma 0.45, > linearity 0.10) built with the following colprof parameters: > -qu -bn -y -al -nc -u > With these profiles on the 5D I obtain a profile that works well with > highlights, but has problems with the black point: the images look foggy > and they require manual black point compensation. Furthermore, the > "black" is not black but it has some color cast (if I measure it I get > something like red 15, blue and green 4). Even more, when using a > profile obtained with the -u option (which I used with success with > other profiles) I cannot get any value above around 250 even burning the > whole image. > > The profile that seems to work best is a linear profile obtained with > the following colprof parameters: > -qu -y -am -bn -nc > Even if it is a bit flat and it brings out a yellish cast in some > lightning conditions (that can, anyway, be corrected by changing the > white balance). > > I have tried all the possible profile kinds, both by using the -u flag > and not using it. I even tried with -U with no success. The black point > problem is especially annoying and I cannot get rid of it with most of > the modes (S and m seem to work better than other modes, especially > without -u). > > Any comment or suggestion related to the problems above (especially the > one with black point) will be highly appreciated. > > Tanks! > > Regards, > Alberto > > -- > Home page: http://www.alari.ch/people/alberto > Photo galleries : http://albertoferrante.name > Public key: http://www.alari.ch/people/alberto/keys/yahoo.asc > > >