''' Module color: Purpose provide support for pixel mutation
'''

def dup( p ) :
    ''' Returns a new pixel whose RGB values are (r, g, b), where r, g,
        and b are are the RGB values of p
    '''

    r, g, b = p

    result = ( r, g, b )

    return result

def neg( p ) :
    ''' Returns a new pixel whose RGB values are the inverse of p, that is
        (255 - r, 255 - g, 255 - b), where r, g, and b are are the RGB
        values of p
    '''
   
    r, g, b = p

    result = ( 255 - r, 255 - g, 255 - b )

    return result

def blue( p ) :
    ''' Returns a new pixel whose RGB values are (0, 0, b), where b is
        the B value of p
    '''
   
    r, g, b = p

    result = ( 0, 0, b )

    return result

def bw( p ) : 
    ''' Returns a new pixel whose RRB values are either (0, 0, 0) or
        (255, 255, 255).  It is the former if ( r + g + b ) // 3 is less
        than 255 // 2; otherwise, it is the later otherwise, where r,
        g, and b are are the RGB values of p
    '''

    r, g, b = p

    avg_level = ( r + g + b ) // 3

    if ( avg_level < 255 // 2 ) :
        result = (   0,   0,   0 )
    else :
        result = ( 255, 255, 255 )

    return result

def grey( p ) :
    ''' Returns a new pixel whose RGB values are (m, m, m) where m is
        is the integer cast of .299r + .587g + .114b, where r, g, and b
        are the RGB values of p
    '''

    pass

def sepia( p ) :
    ''' Returns the sepia equivalent of p according to the homework specification   '''

    pass

def distance( p1, p2 ) :
    ''' Returns the distance between p1 and p2; that is the sum of the 
        red differences, green differences, and blue differences, where
        difference is an absolute value
    '''

    pass

PALETTE8 = [ (  0,  0,  0), (255,255,255), (  0,255,  0), (  0,  0,255),
             (255,  0,  0), (255,255,  0), (255,  0,255), (  0,255,255) ]

def simplify( p ) :
    ''' Returns the pixel in PALETTE8 that p is closest too
    '''

    pass