1
auto : Auto Color Correction.
3
bcg : Brighness / Contrast / Gamma.
4
cb : Color Balance Correction.
5
curves : Histogram Curves Correction.
6
decorate : Decorative Effects.
8
greystoration : CImg library interface for Greystoration filter.
9
hsl : Hue / Saturation / Lightness.
10
icc : Color Management.
11
levels : Histogram Levels Correction.
12
lens : Misc lens correction filters.
13
lc : Local Contrast (LDR Tonemapping).
14
nr : Wavelets Noise Reduction.
15
sharp : Sharp / Unsharp Mask / Refocus
16
transform : Change Image Geometry.