| prapi::color::ColorCorrelogram | A feature extractor that calculates the color correlogram for an RGB color image |
| prapi::color::ColorCubeExtractor< T, comps > | ColorCubeExtractor creates a multi-dimensional histogram out of any color matrix |
| prapi::color::ColorPercentile | A feature extractor for calculating color percentiles |
| prapi::color::ColorRatio< T > | ColorRatio implements the preprocessing step of the color constant color indexing method of Funt and Finlayson |
| prapi::color::CompNorm | "Comprehensive Normalization" for RGB color images as described by Finlayson et.al |