Image-Based Estimation of Metal Powder Coverage on Ultrasound-Treated Bacterial Nanocellulose

This program is a Rust-based command-line tool designed to analyze images in a specified directory and estimate the proportion of pixels that may correspond to metallic surfaces. It processes all files in the given folder in parallel. For each image, the program loads pixel data and converts it from RGB to HSL color space. It then applies a simple heuristic: pixels with relatively high saturation and lower lightness are classified as “metal-like.” Based on this classification, the program calculates the percentage of such pixels relative to the total number of pixels in the image. The results are collected, sorted alphabetically by file name, and displayed in a formatted table showing each image alongside its estimated metal coverage percentage. A progress bar is also provided during execution to indicate processing status.