diff --git a/images-exp.ipynb b/images-exp.ipynb
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+{
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "## Working with images in Python."
+      ]
+    },
+    {
+      "cell_type": "code",
+      "metadata": {},
+      "source": [
+        "%matplotlib inline\n",
+        "import numpy as np\n",
+        "import matplotlib.pyplot as plt\n",
+        "import imageio\n",
+        "f0 = imageio.imread('http://sipi.usc.edu/database/download.php?vol=misc&img=4.2.03', as_gray=True)/255\n",
+        "N = f0.shape[0]\n",
+        "M = f0.shape[1]\n",
+        "np.random.seed(42)\n",
+        "f = f0 + 0.5 * (np.random.rand(*f0.shape) - 0.5)\n",
+        "x0 = f\n",
+        "plt.imshow(f, interpolation='nearest', cmap=plt.cm.get_cmap('gray'), vmin=0, vmax=1)\n",
+        "plt.axis('off')\n"
+      ],
+      "outputs": [],
+      "execution_count": null
+    }
+  ],
+  "metadata": {
+    "anaconda-cloud": {},
+    "kernelspec": {
+      "display_name": "Python 3",
+      "language": "python",
+      "name": "python3"
+    },
+    "language_info": {
+      "codemirror_mode": {
+        "name": "ipython",
+        "version": 3
+      },
+      "file_extension": ".py",
+      "mimetype": "text/x-python",
+      "name": "python",
+      "nbconvert_exporter": "python",
+      "pygments_lexer": "ipython3",
+      "version": "3.6.1"
+    }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 1
+}
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