1. A method comprising: receiving first binary pixel values, the first binary pixel values having been obtained by applying light of a first known color through an array of color filters onto an array of binary pixels, individual ones of said color filters being of unknown color; receiving second binary pixel values, the second binary pixel values having been obtained by applying light of a second known color through said array of color filters onto said array of binary pixels; receiving information on the colors of said light of said first and second known colors applied through said array of color filters onto said array of binary pixels; forming an estimate of a color of a color filter associated with each of said binary pixels having binary pixel values indicating activation by said light of at least one of said known colors using said information on the colors of said light of said first and second known colors; and storing estimates of the colors of said color filters in an image processing system for subsequent use in processing images.