continue
		}
		// Compare the average delta to the tolerance level.
		avgDelta := averageDelta(m0, m1)
		if avgDelta > tc.tolerance {
			t.Errorf("%s: average delta is too high. expected: %d, got %d", tc.filename, tc.tolerance, avgDelta)
			continue
		}
	}
}

func TestSubImage(t *testing.T) {
	m0, err := readImg("../testdata/video-001.gif")