How to Grayscale Image in Tcl - Code Snippet

# Task: Grayscale Image
# Language: Tcl

proc grayscale_image() {
    # Implementation for Grayscale Image
    set result = ...; # Initialize variable
    # TODO: Implement core logic here
    # Step 1: Prepare data
    # Step 2: Process Grayscale Image
    puts("Done");
}