Hi, I would like to follow your approach and compare the Darktable profiles for my Nikon D750 with the ones I did on my own and your method. I found the camera raw plug-in downloader from adobe in version 10.3 and downloaded it for both, mac and windows. Now Im stuck: Neither using wine and the nullsoft installer nor using xar to extract the macOSX package gave me the dcp files. Am I missing something? Could you please give some more details on how to get your color matrices?
Cheers, Dave 2018-05-04 21:10 GMT+02:00 Sarge Borsch <sausagefacto...@gmail.com>: > So, I tried to edit an ICC file in a hex editor to put the values from > that website, and, just as expected, got nonsensical results. > > After that I tried another idea to snatch better color profiles — I > searched the web for Adobe Camera Raw package, extracted the profiles from > it (they are in .dcp format), and figured that it's possible to convert > them to ICC by dcamprof. > They seem to work very well — better than the currently built-in input > profiles for sony a5100 in darktable. > Now what do you think about the copyright status of these converted ICC > profiles? Can they legally be distributed with darktable, or should I keep > them only for myself? > They are a lot smaller than the source .dcc files, probably because they > don't keep nothing valuable except the color matrices. So are 3x3 numeric > matrices copyrightable? > > If you think these profiles can be officially added to darktable, I may > fix the name tags and submit a pull request. > > > On 4 May 2018, at 17:14, Sarge Borsch <sausagefacto...@gmail.com> wrote: > > > > Hi. > > I see that there are measured color responses at > https://www.dxomark.com/Cameras/Sony/A5100---Measurements > > Hence the question: is it a good idea to try to take the built-in > profile and replace the primaries with these measured values, in order to > get closer to the in-camera JPEG color rendering? (or are they already > used?) > > > > I'm asking that because I've noticed that none of the built-in input > color profiles for sony a5100 allows me to get close to the in-camera JPEG > colors. > > The 2 of them which are the closest to the correct rendering (that is, > matching camera JPEG, which is quite good when judging by eye) are the > "standard color matrix" and "linear Rec2020 RGB". > > Both of them wildly differ from the in-camera JPEG in deep blue colors: > "standard color matrix" causes them to be clipped and to look really > unnatural, and "linear Rec2020 RGB" looks more or less natural, but the hue > is obviously different (blue gets moved to cyan). Hence I started to wonder > how easy is it to get a better color profile. > > > > I know that ideally this should be done with a color chart, but I don't > have one and don't have spare money for it at the moment. > > > > Also I can share a shot of the example object (Raw + JPEG) which has > such problematic color if anyone wants to test it, too. > > ____________________________________________________________ > _______________ > darktable developer mailing list > to unsubscribe send a mail to darktable-dev+unsubscribe@ > lists.darktable.org > > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
