from PIL import Image
import colorsys
img = Image.open('aa.png').convert('RGB')
w, h = img.size
data = img.load()

cycles = 4
inc = 0
step = cycles /(w * h)
for y in range(h):
    for x in range(w):
        r, g, b = data[x, y]
        hsv = colorsys.rgb_to_hsv(r/255, g/255, b/255)
        hue = colorsys.hsv_to_rgb(hsv[0] + inc, hsv[1], hsv[2])
        data[x, y] = tuple([int(255 * x) for x in hue])
        inc += step

img.save('out.png')