This was a weekend project done in C# to create a histogram or "video barcode" representing the average colors of the frames in a movie, where every pixel is a second of the film (24 frames). In samples/avatar.jpg, the file is 10,679 px wide, which is equivalent to 178 minutes.
Some files were computed using the average RGB values, but these images are less vibrant. The better looking images instead use an HSV averaging approach @tanczosm suggested. Separating lightness and darkness from color and focusing on the hue allows for colors to avoid becoming washed out in dark scenes.
