class ChunkyPNG::Palette

def determine_bit_depth

Returns:
  • (Integer) - Number of bits per pixel, i.e. 1, 2, 4 or 8, or nil if this 
def determine_bit_depth
  case size
    when 1..2; 1
    when 3..4; 2
    when 5..16; 4
    when 17..256; 8
    else nil
  end
end