A Rust implementation of the AGCWD algorithm.
AGCWD is described in the paper "Efficient Contrast Enhancement Using Adaptive Gamma Correction With Weighting Distribution".
```rust // An example image containing 2 RGB pixels. let mut pixels = vec![0, 1, 2, 3, 4, 5];
let agcwd = agcwd::Agcwd::new(0.5); agcwd.enhancergbimage(&mut pixels); ```