class ChunkyPNG::Palette

def black_and_white?

Other tags:
    See: ChunkyPNG::Color#grayscale?? -

Returns:
  • (true, false) - True if all colors in this palette are grayscale teints. 
def black_and_white?
  entries == [ChunkyPNG::Color::BLACK, ChunkyPNG::Color::WHITE]
end