{"action":"created","issue":{"url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/2901","labels_url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/2901/labels{/name}","comments_url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/2901/comments","events_url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/2901/events","html_url":"https://github.com/Beep6581/RawTherapee/issues/2901","id":105159226,"number":2901,"title":"Feature request: generating a profile / color adjustments file by comparing to TIFF files","user":{"login":"assaft","id":4903680,"avatar_url":"https://avatars.githubusercontent.com/u/4903680?v=3","gravatar_id":"","url":"https://api.github.com/users/assaft","html_url":"https://github.com/assaft","followers_url":"https://api.github.com/users/assaft/followers","following_url":"https://api.github.com/users/assaft/following{/other_user}","gists_url":"https://api.github.com/users/assaft/gists{/gist_id}","starred_url":"https://api.github.com/users/assaft/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/assaft/subscriptions","organizations_url":"https://api.github.com/users/assaft/orgs","repos_url":"https://api.github.com/users/assaft/repos","events_url":"https://api.github.com/users/assaft/events{/privacy}","received_events_url":"https://api.github.com/users/assaft/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-09-07T07:05:43Z","updated_at":"2015-09-07T08:48:46Z","closed_at":null,"body":"I'm not sure whether this is feasible but I think it can be helpful. The goal is to make it easier to reproduce, in a RAW workflow, the color adjustments that the manufacturers do in their jpeg engine. Currently the only straightforward way to do that is by using Adobe's color profiles, but I found them not so accurate, at least for my cameras.  \r\n\r\nSo I'm thinking of an alternative way of reproducing the color signature of the manufacturer RAW converter. This is the idea:\r\n\r\n1. Take a picture of a color checker.\r\n2. Develop the RAW file using the manufacturer proprietary RAW converter. Obtain a TIFF file that incorporates all the color adjustments that the manufacturer does (by default).\r\n3. Develop the RAW using the most basic profile, or no profile at all, in RT and obtain a TIFF file.\r\n4. Run some sort of 'diff' between the TIFF created by the basic/no profile in RT and the TIFF created by the manufacturer's RAW converter. The result of this 'diff' (i.e. the delta between the two TIFF files) should be saved as a profile or a set of color adjustments. \r\n\r\nThen, when a new RAW is developed, it should be possible to open it with the basic/no profile, and subsequently to apply the delta that was previously created. This will simulate the manufacturer's rendering while keeping the workflow in the RAW converter. \r\n\r\nIn some way this is similar to the algorithm that automatically corrects distortion based on the embedded JPEG. The algorithm checks how the JPEG was corrected in relation to the RAW file being developed and tries to infer the correction parameters. So What I'm asking about here is whether a similar algorithm is possible with respect to color, based on an image of a color checker. \r\n"},"comment":{"url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/comments/138240264","html_url":"https://github.com/Beep6581/RawTherapee/issues/2901#issuecomment-138240264","issue_url":"https://api.github.com/repos/Beep6581/RawTherapee/issues/2901","id":138240264,"user":{"login":"Beep6581","id":5844619,"avatar_url":"https://avatars.githubusercontent.com/u/5844619?v=3","gravatar_id":"","url":"https://api.github.com/users/Beep6581","html_url":"https://github.com/Beep6581","followers_url":"https://api.github.com/users/Beep6581/followers","following_url":"https://api.github.com/users/Beep6581/following{/other_user}","gists_url":"https://api.github.com/users/Beep6581/gists{/gist_id}","starred_url":"https://api.github.com/users/Beep6581/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Beep6581/subscriptions","organizations_url":"https://api.github.com/users/Beep6581/orgs","repos_url":"https://api.github.com/users/Beep6581/repos","events_url":"https://api.github.com/users/Beep6581/events{/privacy}","received_events_url":"https://api.github.com/users/Beep6581/received_events","type":"User","site_admin":false},"created_at":"2015-09-07T08:48:46Z","updated_at":"2015-09-07T08:48:46Z","body":"This is what the Film Simulation tool does, the problem is it uses a raster image instead of a raw image, so the target raw development program probably won't do the same things to it as it would to a raw file... unless you trick it into treating it as a raw file. Have you tried that? Convert the identity image to a linear DNG and open it in the target raw converter?"}}