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diff --git a/rgb_image_subpixel.cc b/rgb_image_subpixel.cc
new file mode 100644
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--- /dev/null
+++ b/rgb_image_subpixel.cc
@@ -0,0 +1,86 @@
+
+///////////////////////////////////////////////////////////////////////////
+// This program is free software: you can redistribute it and/or modify  //
+// it under the terms of the version 3 of the GNU General Public License //
+// as published by the Free Software Foundation.                         //
+//                                                                       //
+// This program is distributed in the hope that it will be useful, but   //
+// WITHOUT ANY WARRANTY; without even the implied warranty of            //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      //
+// General Public License for more details.                              //
+//                                                                       //
+// You should have received a copy of the GNU General Public License     //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.  //
+//                                                                       //
+// Written by Francois Fleuret, (C) IDIAP                                //
+// Contact <francois.fleuret@idiap.ch> for comments & bug reports        //
+///////////////////////////////////////////////////////////////////////////
+
+#include "rgb_image_subpixel.h"
+
+RGBImageSubpixel::RGBImageSubpixel(int width, int height) : RGBImage(width * _scale, height* _scale) { }
+
+RGBImageSubpixel::RGBImageSubpixel(RGBImage *image) : RGBImage(image->width() * _scale, image->height() * _scale) {
+  for(int y = 0; y < _height; y++) {
+    for(int x = 0; x < _width; x++) {
+      set_pixel(x, y,
+                image->pixel(x / _scale, y / _scale, RGBImage::RED),
+                image->pixel(x / _scale, y / _scale, RGBImage::GREEN),
+                image->pixel(x / _scale, y / _scale, RGBImage::BLUE));
+    }
+  }
+}
+
+RGBImageSubpixel::~RGBImageSubpixel() { }
+
+void RGBImageSubpixel::read_ppm(const char *filename) {
+  abort();
+}
+
+void RGBImageSubpixel::write_ppm(const char *filename) {
+  abort();
+}
+
+
+void RGBImageSubpixel::read_png(const char *filename) {
+  abort();
+}
+
+void RGBImageSubpixel::write_png(const char *filename) {
+  RGBImage tmp(_width / _scale, _height / _scale);
+  for(int y = 0; y < _height / _scale; y++) {
+    for(int x = 0; x < _width / _scale; x++) {
+      int sr = 0, sg = 0, sb = 0;
+      for(int yy = y * _scale; yy < (y + 1) * _scale; yy++) {
+        for(int xx = x * _scale; xx < (x + 1) * _scale; xx++) {
+          sr += int(_bit_plans[RED][yy][xx]);
+          sg += int(_bit_plans[GREEN][yy][xx]);
+          sb += int(_bit_plans[BLUE][yy][xx]);
+        }
+      }
+
+      tmp.set_pixel(x, y,
+                    sr / (_scale * _scale), sg / (_scale * _scale), sb / (_scale * _scale));
+    }
+  }
+  tmp.write_png(filename);
+}
+
+
+void RGBImageSubpixel::read_jpg(const char *filename) {
+  abort();
+}
+
+void RGBImageSubpixel::write_jpg(const char *filename, int quality) {
+  abort();
+}
+
+
+void RGBImageSubpixel::draw_line(int thickness,
+                                 unsigned char r, unsigned char g, unsigned char b,
+                                 scalar_t x0, scalar_t y0, scalar_t x1, scalar_t y1) {
+  RGBImage::draw_line(int(thickness * _scale),
+                      r, g, b,
+                      x0 * _scale + _scale/2, y0 * _scale + _scale/2,
+                      x1 * _scale + _scale/2, y1 * _scale + _scale/2);
+}