Detail of the Merian map of Paris (scale: ca. 1 to 7,000) : here, "pont Marchant". The original left and right halves of the map from Gallica were cropped and joined together and converted to grayscale, and the light levels altered with Photoshop Elements v 4.0. The assembled map is about 76 x 50 cm with a resolution of 400 pixels/inch.