Small utility to convert images to ASCII art.

Usage: asciify <flags> [arguments]
    --output         Path to output ASCII file (prints to stdout if empty)
-w, --width          Output ASCII width (characters)
                     (defaults to "80")
-h, --height         Output ASCII height (lines)
                     (defaults to "40")
    --bg-char        Character used for transparent pixels or background
                     (defaults to " ")
-c, --chars          String of ASCII characters from dark to light
                     (defaults to ".,:;i1tfLCG08@")
    --[no-]invert    Invert brightness mapping
    --help           Print this usage information