[Tomcomm]

Great simulations Wayne! I know nothing regarding Photoshop Pro, but their filter capabilities must be awesome. My little Photo Impact’s custom filters only effect a 5 X 5 pixel zone, resulting in an overall softening or other distortions. No way can it filter color content of red, blue or green components. Obviously, Photoshop is capable of simulating the color separation of a dicroic filter into their primary colors. Developing I and Q components from the 32bit chroma of each pixel and combining them in quadrature and then bandpass filtering them to produce perfect NTSC baseband bit streams. Is this a canned program within Photoshop or did you develop this NTSC simulation on your own? Whatever, you certainly are an expert in TV system simulations.

When you conducted comparisons of the 1984 RCA solid state I, Q, WB receiver with the current Zenith R-Y, B-Y, NB receivers you noticed improvement in the RCA’s red detail, but also the presence of quad crossover distortion artifacts along color transition edges, The 1954 IRE Color TV issue had a 1953 paper by Hazeltine on the very subject of “Quadrature Cross Talk in NTSC Color TV”. Seems this problem was solved in the fully compliant NTSC WB, IQ implementation of RCA’s first production models., the CT 100 and 21CT55, using the CTC2/B chassis. That same IRE issue described a true laboratory standard color receiver built by Sylvania in 1953 which was fully NTSC compliant and very similar to the RCA CTC2/B WB IQ decoder. It had an additional NB R-Y, B-y decoder similar to the RCA CTC4 thru CTC38 at least. These decoders could be switched to the same 15in CRT display for picture quality comparisons. Regarding the NB R-Y, B-Y , their comment was "Although this method gives the desired result, much detail is lost due to narrow-band operation”. I have to assume if any cross-talk artifacts were present in the lab standatd WB, IQ receiver it would have been well reported.