# Wersja Oli
for x in range(0, M):
    for y in range(0, N):
        if((I[x, y] * const) > 255):
            I[x, y] = 255
        elif((I[x, y] * const) < 0):
            I[x, y] = 0
        else:
            I[x, y] = I[x, y] * const

# wersja moja
for x in range(0, M):
    for y in range(0, N):
        if((I[x, y] * const) > 255):
            I[x, y] = 225
        elif((I[x, y] * const) < 0):
            I[x, y] = 0
        else:
            I[x, y] = I[x, y] * const