def levels(self):
        
        """Returns a histogram for each RGBA channel.
        
        Returns a 4-tuple of lists, r, g, b, and a.
        Each list has 255 items, a count for each pixel value.
                
        """
        
        h = self.img.histogram()
        r = h[0:255]
        g = h[256:511]
        b = h[512:767]
        a = h[768:1024]
        
        return r, g, b, a
def levels(self):
        
        """Returns a histogram for each RGBA channel.
        
        Returns a 4-tuple of lists, r, g, b, and a.
        Each list has 255 items, a count for each pixel value.
                
        """
        
        h = self.img.histogram()
        r = h[0:255]
        g = h[256:511]
        b = h[512:767]
        a = h[768:1024]
        
        return r, g, b, a
def levels ( self ) : h = self . img . histogram ( ) r = h [ 0 : 255 ] g = h [ 256 : 511 ] b = h [ 512 : 767 ] a = h [ 768 : 1024 ] return r , g , b , a
Returns a histogram for each RGBA channel.
        
        Returns a 4-tuple of lists, r, g, b, and a.
        Each list has 255 items, a count for each pixel value.
Returns a histogram for each RGBA channel . Returns a 4 - tuple of lists r g b and a . Each list has 255 items a count for each pixel value .