Function process_image_file 

pub fn process_image_file(
    input_path: &str,
    output_path: &str,
) -> Result<(), String>

Processes an image file, extracts color data, and saves the resulting image.

Arguments

• input_path - The path to the input image file.
• output_path - The path where the resulting image will be saved.

Returns

A Result indicating success or failure. If successful, returns Ok(()). If an error occurs, returns Err with an error message.