sobczal2/img

AI Summary: Implement a gamma correction filter for the `img` image manipulation tool. The filter should be added to the CLI and library, using a similar approach to the existing grayscale and sepia filters. This involves creating a function that adjusts the pixel intensities based on a gamma value, and integrating it into the existing image processing pipeline.

AI Summary: Create unit tests for the `mean_blur` function and its helper functions within the `img` Rust image processing library. This involves writing test cases to verify the correctness of the mean blur algorithm's output for various inputs and edge cases.