/usr/share/fotoxx/data/retouch_combo/lighten low is in fotoxx-common 16.11.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | all == 1
red == 0
green == 0
blue == 0
amplify == 1
brightness == 0
contrast == 0
satlevel == 0
wbtemp == 5000
areaemph == 0.5
dist == 0
click == 0
curves
5
0 6 0.009/0.074 0.047/0.129 0.242/0.331 0.472/0.479 0.739/0.718 0.990/0.980 1.000/1.000
0 6 0.009/0.074 0.047/0.129 0.242/0.331 0.472/0.479 0.739/0.718 0.990/0.980 1.000/1.000
0 5 0.010/0.010 0.250/0.250 0.500/0.500 0.750/0.750 0.990/0.990
0 5 0.010/0.010 0.250/0.250 0.500/0.500 0.750/0.750 0.990/0.990
0 5 0.010/0.010 0.250/0.250 0.500/0.500 0.750/0.750 0.990/0.990
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