An optical multiplexing device includes a light bandpass filter that passes a first light wavelength at a first angle of incidence and passes a second light wavelength at a second angle of incidence. The color image processing system includes a print data receiving unit that receives print data, a bitmap data producing unit that produces bitmap data having colors that correspond to the plurality of color developers from the print data, a data size determining unit that determines a data size of the bitmap data, and a degrading unit. When the document is first printed a record is made of the document so that when the documents are scanned, confirmation can be made that every document that is printed with a graphic code is subsequently scanned or otherwise accounted for. Upon the first site receiving an affiliation message, it joins a payload multicast group address to receive payload for the talkgroup.