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As only a minor nitpick (my excuse is that this is my day job), you've got it the wrong way round - REDCODE is actually storing data as RGB, whereas 'every othe
by jermy 15y ago
As only a minor nitpick (my excuse is that this is my day job), you've got it the wrong way round - REDCODE is actually storing data as RGB, whereas 'every other camera' is almost certainly using a MPEG-based codec and storing it as YUV with chroma subsampling - somewhere between 4:1:1/4:2:0 to 4:2:2 depending on the camera in use.
As with any lossless compression, it's a compromise between having almost all of the data shot to work with versus pretty much having to always do a full grade on any content you get and the additional online storage space needed in post-production.
- zokier 15y agoThe Wikipedia page of REDCODE claims that it contains the Bayer-patterned subpixel data, so it's more comparable to RAW images than rendered RGB images. But according to that page, it's also lossy format, which makes it quite interesting technically.
- stephen_g 15y agoAre all the MPEG codecs YUV? I know MPEG2 is but I thought MPEG4/H.264 wasn't. Now that I think about it, you're probably right about that part (as for other codecs, I know the ProRes codec that the Alexa typically shoots (unless you use the ArriRAW recorder but hardly anyone does yet) definitely is YUV, but the HDCAM tapes that some of the more expensive Sony cameras shoot isn't). But the point still stands that RGB and YUV codecs aren't RAW like REDCODE is. REDCODE itself isn't exactly RGB. It actually is pretty interesting - it does store the red, green and blue pixels separably, but it's not usually classified as RGB since it stores two green channels for every red and blue channel (because of the way the bayer filter on the sensor is arranged - there's twice as many green pixels as red and blue), and because those channels haven't been demosaiced/debayered[1]. 1. http://en.wikipedia.org/wiki/Demosaicing http://en.wikipedia.org/wiki/Demosaicing