I have a Panasonic Plasma TV with pixel direct which allows you to set the display to accept a 4:4:4 sub-sampling rate. This function is grayed out unless the source supports 4:4:4. (IE: changing my BD player to 4:4:4 from the default setting of 4:4:2 engages the pixel direct function) When using my 3600r player, the pixel direct function can be engaged, which means that it is set at the 4:4:4 sub-sampling rate. I thought all Roku's are set at 4:4:0 or 4:4:2. Why would the 3600r be set to 4;4:4 when there isn't any programming that I'm aware of that supports 4:4:4?