Sorry, the links I pasted don't appear to be good. Go to youtube and search for harry durgin. He did videos on generating icc profiles and generating basecurves to match jpegs.
On Thu, May 31, 2018 at 8:43 PM, William Ferguson <wpfergu...@gmail.com> wrote: > Harry Durgin did a couple videos on that > > https://www.youtube.com/redirect?v=11nInNWJHWk&event= > video_description&q=http%3A%2F%2Fweeklyedit.com%2Fcamera- > profiling-darktable-chart%2F&redir_token=u1328WDSXNhekRzZLid7MbFMgGh8MT > UyNzkwMDE0NkAxNTI3ODEzNzQ2 > > and > > https://www.youtube.com/redirect?redir_token= > x1pQe5b4RXUCYmFePOfoRGWv5Fh8MTUyNzkwMDE4NkAxNTI3ODEzNzg2&v= > LufwQZx01gk&q=http%3A%2F%2Fweeklyedit.com%2Fbasecurves% > 2F&event=video_description > > > > On Thu, May 31, 2018 at 6:51 PM, Robin Kramer <kodr...@gmail.com> wrote: > >> Ah, I also get weird initial color profiles with a5100. I usually try to >> match the jpeg. I might try to generate a custom ICC then. I have a color >> checker card. I forget what is the best software to do that. >> >> > On May 5, 2018, at 2:55 AM, Sarge Borsch <sausagefacto...@gmail.com> >> wrote: >> > >> > Regarding the copyrights question: >> > The ICC profile that I got as the result of the conversion is 536 >> bytes, at least 29 of which are the ASCII name string that is equal to >> "Sony ILCE-5100 Adobe Standard". >> > It contains only the following tags: >> > desc, >> > cprt (= "Copyright, the creator of this profile (generated by DCamProf >> v1.0.5)"), >> > wtpt (1 XYZ tuple), >> > rXYZ, rXYZ, rXYZ, (the most important and probably the only part we >> actually need — the color matrix), >> > and tone response curves which are just straight lines. >> > >> > As I see, the only thing in the final ICC profile that could possibly >> be non-trivial enough to raise copyright questions is the 3x3 color matrix. >> > >> > >> >> On 4 May 2018, at 22:10, Sarge Borsch <sausagefacto...@gmail.com> >> wrote: >> >> >> >> 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@list >> s.darktable.org >> > >> ____________________________________________________________ >> _______________ >> darktable developer mailing list >> to unsubscribe send a mail to darktable-dev+unsubscribe@list >> s.darktable.org >> >> > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
