Prior to the modern digital age, photographs could be seen framed on a desk or hanging on the wall, scattered on a table, well organized in an album or in their protective sleeves at the photographer's. You could find them in the most popular format (4" x 6") or in various enlargements or in a Photo ID. Wherever and in any case, with only "Polaroid" as an exception, to get a picture printed you needed to go through negative developing. The most popular format, especially in the years when amateur photography became popular, was the 135, aka 35mm. It had a proportion of 2:3, that today you can only find as a "full format" in professional digital photography. It was available commercially in the form of "rolls of film" and could capture from 12 to 36 photos. Different films and procedures distinguished "Black and White"- which was often developed at home, also by amateur photographers - from "Color Photos".