The process is exactly the same as those printing colour film in the darkroom haves to deal with. Sometimes you just cant open your image files in Rawtherapee, but you can, you just have to input the correct file extensions into Rawtherapees settingsP. (Other command line converters can be used instead. This sounds complicated, but you will get the hang of it quickly, and start seeing the relationship between temperature (blue/yellow) and tint (green/magenta). RawTherapee command line interface rawtherapee-cli converts NEF file to a temporary PNG file -n with 16 bits per channel colour depth -b16 (which is good for future retrieval details from shadows etc). If you stare at it too long your eyes will adjust and you will be blind to the colour cast - look at something else for a few seconds or a minute and come back to it. For PC Make sure you have GIMP installed. I am not as experienced with scanning film and have just started over the last few months, but this came at a great time for me as I hadn't found a good simple free tool I could use. You can drag the RawTherapee icon into your Applications folder to keep RAWTherapee handy when you need it. Adjust while trying to look for that neutral, then evaluate. RawTherapee in their 5.7 release added a new module called Film Negative tool which allows for some quick film scanning edits. Other programs like GIMP, RAWtherapee, darktable and the desktop version of. ![]() If you do, look for a neutral area that you know well, such as grey asphalt or the brown earth in a forest. Add to this what software to use to convert colour negatives to positives. When this happens, you can try cycling through the different automatic presets for white balance in the NLP “Edit” tab, but you might have to adjust it manually. BIG UPDATE AS OF JAN 2023 : Rawtherapee v5.9 has, since I wrote this article, introduced the Negative Converter widget for all kinds of negative scans now. The result is that the greenery in your forest looks dull, while the tree trunk and earth looks magenta. In a forest, NLP will see a lot of green and try to compensates for that by adding more magenta. ![]() NLP does give you quite pleasing colours, but it will usually struggle to get the white balance right, especially if the scene contains a lot of a single colour, such as a blue sky or a green forest. RawTherapee 5.
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