auto          : Auto Color Correction.
bw            : Black and White.
bcg           : Brightness / Contrast / Gamma.
cb            : Color Balance Correction.
curves        : Histogram Curves Correction.
decorate      : Decorative Effects.
film          : Color negative simulation.
fx            : Special Effects including color FX and 3D Lut.
greystoration : CImg library interface for Greystoration filter.
hotpixels     : Hot Pixels Fixer
hsl           : Hue / Saturation / Lightness.
icc           : Color Management.
imgqsort      : Image Quality Sorter.
lc            : Local Contrast (LDR Tonemapping).
lens          : Misc lens correction filters.
levels        : Histogram Levels Correction.
nr            : Wavelets Noise Reduction.
raw           : RAW image processing
redeye        : Red-Eye Detection and Correction.
sharp         : Sharp / Unsharp Mask / Refocus
transform     : Change Image Geometry.
wb            : White Balance.
