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diff --git a/image_pnm.cpp b/image_pnm.cpp
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+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * Copyright 2008-2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include <assert.h>
+#include <stdint.h>
+
+#include "image.hpp"
+
+
+namespace Image {
+
+/**
+ * http://en.wikipedia.org/wiki/Netpbm_format
+ */
+void
+Image::writePNM(std::ostream &os) const {
+    assert(channels == 1 || channels >= 3);
+
+    os << (channels == 1 ? "P5" : "P6") << "\n";
+    os << width << " " << height << "\n";
+    os << "255" << "\n";
+
+    const unsigned char *row;
+
+    if (channels == 1 || channels == 3) {
+        for (row = start(); row != end(); row += stride()) {
+            os.write((const char *)row, width*channels);
+        }
+    } else {
+        unsigned char pixel[3] = {0, 0, 0};
+        for (row = start(); row != end(); row += stride()) {
+            for (unsigned x = 0; x < width; ++x) {
+                for (unsigned channel = 0; channel < channels; ++channel) {
+                    pixel[channel] = row[x*channels + channel];
+                }
+                os.write((const char *)pixel, sizeof pixel);
+            }
+        }
+    }
+}
+
+
+} /* namespace Image */