Fra http://codecs.onerivermedia.com/ - 4:2:2 Compressed Codec Formats
PhotoJPEG at its highest 100% quality setting is actually a 4:4:4 codec. When reduced down to 75%, it switches to 4:2:2 to help with the compression scheme. So why is it included here? The AJA Kona SD and Blackmagic Design DeckLink use this codec at 75% quality for its default offline compressed mode and with good reason. Virtually no banding in the gradients and average mosquito edging on the RGB colors. The compression artifacts are really only noticeable in the NTSC color bars and a little in the color filter test. And look at the x10 generation test... almost a pixel-perfect copy of the first generation! It actually passes through generations better than Kona's own 10-bit Trillions codec. Amazing! And look at that file size! Only 2.7 MB per second! That's better bandwidth (and way better quality) than DV can ever dream of. This codec truly can pass for an online codec with no problem. Best part is this codec is free to any QuickTime user, can be used on any platform and runs great even on PowerBooks.
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