overlay image with annotations.

annotate_image.py

# coding: utf-8

import matplotlib.pyplot as plt
import Image

img = Image.open('truman-stairs.jpg')
fig, ax = plt.subplots(figsize=(12,12))
ax.imshow(img, aspect='equal')

ax.add_patch(
        plt.Rectangle((30,30),
            64, 128, fill = False, edgecolor='red', linewidth=3.5)
        )

ax.text(30, 30-2,
        'helloooooooo',
        bbox=dict(facecolor='blue', alpha=0.5),
        fontsize=20, color='white')

plt.axis('off')
plt.tight_layout()
plt.show()

fig.savefig('/tmp/edited.png')
plt.close(fig)