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Basecurves

Let’s build our own basecurves

In this episode I work through each of the steps needed to build a custom basecurve. I also share some code I use to build a separate base curve for each camera body and ISO I use. In the end I show how to set up Darktable to automatically apply the appropriate basecurve to your RAW files.

Another in our faster format, but packed with information. It builds on knowledge from previous videos, running full-tilt through tools and methods to achieve the edit. For fuller explanations, return to the Home Page and scroll down to Topics Discussed or Modules Used on the right-hand bar. Click on any of these, and we assemble a complete playlist of every instance from a knowledge base of our first 27 videos for quick review right here on the site.

Build dt-curve-tool

cd
cp .config/darktable/data.db .config/darktable/data.db.bak
git clone git://github.com/darktable-org/darktable.git
cd darktable/tools/basecurve
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=$YOUR_INSTALL_PATH -DCMAKE_BUILD_TYPE=Release ..
sudo cmake --build . -- install

sample.jpg for creating basecurve

My script to build basecurves (make sure Darktable isn’t running when you run this)

#!/bin/zsh
rm iso_model_* basecurve.dat basecurve.fit.dat basecurve.sh dt-curve-tool.bin tonecurve.dat tonecurve.fit.dat
ls |grep -i jpg |head -n1 |cut -d'.' -f1 |read file
ls "$file".* |grep -iv jpg |grep -iv xmp |head -n1 |cut -d'.' -f2 |read ext
ls *.$ext |while read file; do
  exiftool "$file" |grep -i iso |head -n1 |awk -F': ' '{print $2}' |read iso
  exiftool "$file" |grep -i model |head -n1 |awk -F': ' '{print $2}' |read model
  echo $file $iso $model >>iso_model_db
done
cat iso_model_db |cut -d' ' -f2- |sort |uniq >iso_model_combinations
cat iso_model_combinations |while read combo; do
  echo $combo |cut -d' ' -f1 |read iso
  echo $combo |cut -d' ' -f2- |read model
  grep " $combo" iso_model_db |cut -d' ' -f1 |while read file; do
    dt-curve-tool-helper "$file"
    last="$file"
  done
  dt-curve-tool -z -e $last -n6 |sed -e "s/$model/$model ($iso)/g" >basecurve.sh
  sh ./basecurve.sh
  rm basecurve.dat basecurve.fit.dat basecurve.sh dt-curve-tool.bin tonecurve.dat tonecurve.fit.dat
done
tiny planet view of Kahakai Park, Hawaii composed by Harry Durgin in opensource tools Hugin, GIMP, Darktable for his Weekly Edit tutorial

Tiny Planet

Just for fun

In this episode I start with a 360 panorama and make a tiny planet picture. I share some tips on setting up the shot. Then I do some pre-processing in Darktable, assembly in Hugin, conversion to radial in the GIMP, and some final touches back in Darktable.
It's a tiny-planet tour of opensource tools to compose a tiny planet of my local morning.
This video is the latest in our faster-edit format. It builds on knowledge from previous videos, running full-tilt through tools and methods to achieve the edit. For fuller explanations, return to the Home Page and scroll down to Topics Discussed or Modules Used on the right-hand bar. Click on any of these, and we assemble a complete playlist of every instance from a knowledge base of our first 27 videos for quick review right here on the site.