Images have been selected from a large panel of pictures which pixels have been sorted using a special algorithme. This algorithm is simple. Each line (horizontal or vertical) is processed separately. The algorithm begins with the pixel at one end and begins to record in an array all subsequent pixels having a lower or equal brightness. Once it finds a pixel with higher brightness, it sorts the array of pixels previously created in brightness order and starts a new array. And so on until the end of the line before moving on to the next line. Variations have been added in order to obtain different results.