sorry i did’t specify it explicitly: this is still a PR, it’s not merged in dev yet.
If you want to try it before it is merged, you can build my fork of rawtherapee. You can do that by running the following commands, from your home directory.
This makes a backup of the original source directory:
mv programs/code_rawtherapee programs/ORIG_code_rawtherapee
Then, download my fork from github:
git clone "https://github.com/rom9/RawTherapee.git" programs/code-rawtherapee
Switch to the branch that contains this feature:
git checkout filmneg_stable_mults
Finally, run the
build_rawtherapee script with the
-b option, which does just the build without updating the source from the upstrem repo:
And run the compiled executable as reported in the last line printed on the console by the build script. It should be a path like
You should now see the new “Get ratios from crop” button in the film negative tool
To go back to the original upstream source code, just delete the
code_rawtherapee directory, and rename back
code_rawtherapee, then run the build script as usual.
ps.: i forgot a little but important advice: if you plan to digitize an entire roll, when you take pictures of the negatives please do not use the AWB (auto white balance) setting of your camera, but instead use a fixed WB setting for all pictures (like daylight, or tungsten, any setting will be ok as long as it stays constant for all shots).
This is because the channel multipliers chosen by the camera will affect processing in RT, so if you use AWB these multipliers will be slightly different among different pictures, and will produce noticeable shifts in the output, that will need to be compensated by re-balancing each individual picture.
I’m trying to revert this effect to make it transparent to the user, but i still haven’t figured out a way to do it, so for now, just remember to select a fixed WB setting and you’ll be fine