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Will dropping colour-sampling help with possible slow-motion?

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  • Will dropping colour-sampling help with possible slow-motion?

    I know talking about the BMC and slow-motion has been spoken about over and over. But I was just thinking, would dropping down to 8bit colour-sampling help the camera achieve more frames-per-second? Perhaps an 8bit form of ProRes? There is a sensor, the Alexima AM41 (http://www.alexima.com) - it's a 4/3" sensor that can do up to 500FPS in 10bit, and 800FPS in 7bit. Could dropping the colour-sampling down to 8bit push more frames out of the BMC? Would you guys take the trade-off of losing colour information in exchange for more frames (hypothetically speaking)? What do you guys think?
    My Official Blackmagic Micro Footage: https://vimeo.com/155747487

  • #2
    Whether it is theoretically possible depends on sensor specs. I don't think all sensors support ADC sampling step changes. Changing the region of interest would be better I think. For example sampling 1920x1080 area would give you 48fps at the same datarate as full sensor image at 30fps.
    vfx-rants.blogspot.com

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    • #3
      You don't have to change the ADC readout parameters, you just chop/ignore the lower 4 bits after reading the 12 bits, and store the remaining 8 bits.
      What are the sensor specs for the sensor they use. I like the idea.

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      • #4
        Originally posted by redgamma View Post
        What are the sensor specs for the sensor they use. I like the idea.
        It was suggested and thought that this might be the sensor Blackmagic has employed in the Cinema Camera, but I don't think anyone knows for sure (supposedly it is capable of 100fps @ 2.5K, and 240FPS @ 720P):

        http://www.eoshd.com/content/7969/bl...by-bae-systems
        My Official Blackmagic Micro Footage: https://vimeo.com/155747487

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        • #5
          Twixtor.

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          • #6
            Originally posted by Bxl View Post
            Twixtor.
            Twixtor works on simpler shots, sure.
            But not this:
            Shot of a leafless bush in frame moving against the background moving in a different direction. Twixtor fails big time.
            Just a quick example. Happens with chain link fence shots, or any shot with semi sparse or transparent things, including dirty window panes, I could go on and on, but you get the idea.

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            • #7
              I do

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