gris.py

def generaHistogramas(imagen):
	pixeles = imagen.load()
	x,y = imagen.size
	
	imagen_nueva = Image.new("RGB", (x, y))

	hx = dict()
	hy = dict()
	for j in range(y):
		sumax = 0
		for i in range(x):
			p = pixeles[i,j]
			prom = math.ceil(( p[0] +p[1] + p[2] ) / 3.0)
			imagen_nueva.putpixel((i,j),(int(prom),int(prom),int(prom)))

			if i in hy:
				hy[i] += prom
			else:
				hy[i] = prom

			sumax += prom
		if j in hx:
			hx[j] += sumax
		else:
			hx[j] = sumax
	return hx, hy, imagen_nueva