Thread: HDR vs compression question

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  1. #1 HDR vs compression question 
    Senior Member Gaston Fazio's Avatar
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    Hi all:

    Im shooting 8K - 5:1 compression .... when I enable HDR, the compression jumps to 10:1.
    Does that mean that my "A" track and "X"track will be at 10:1 ?

    Any way to shot 8K HDR at 5:1??

    Thanks in advance as always!!!

    G
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  2. #2  
    Senior Member Blair S. Paulsen's Avatar
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    AFAIK there's no way around the write speed cap and you are recording two discrete tracks...

    Cheers - #19
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  3. #3  
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    Only if you reduce your resolution which may or may not work for you. The Recording Time tool from RED has a HDRX button you can enable.
    https://www.red.com/recording-time

    Edit: Just to clarify, you're specifically looking for HDRx and not HDR? I only ask because the title says HDR.
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  4. #4  
    Senior Member Gaston Fazio's Avatar
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    Thanks guys!!!

    Really appreciated

    G.
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  5. #5  
    Senior Member andrewhake's Avatar
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    Just to be clear you are talking bout HDRx right? Your camera is always shooting "HDR" when shooting raw, but yeah when shooting HDRx the compression ratio has to increase.
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  6. #6  
    Senior Member Gaston Fazio's Avatar
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    Quote Originally Posted by andrewhake View Post
    Just to be clear you are talking bout HDRx right? Your camera is always shooting "HDR" when shooting raw, but yeah when shooting HDRx the compression ratio has to increase.
    Yes Sr.

    I forgot the "X"....

    You can tell I was talking about HDRx when I mentioned the "A" and "X" track.

    Thanks for the input

    G
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  7. #7  
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    Shoot some tests. The Heliums have enough dynamic range, you may not need HDRx at all. Just shoot normally, follow the rules for key-to-fill ratio, and expose it reasonably well. The material holds up in post very well.
    marc wielage, csi • colorist/post consultant • daVinci Resolve Certified Trainer
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  8. #8  
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    + 1000 on what Marc said!
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  9. #9  
    Moderator Phil Holland's Avatar
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    There's been a lot of discussion here regarding HDRx and "needing it" in camera anymore.

    I agree, in most cases for general shooting considering the dynamic range of RED's latest sensors it's not the most needed thing.

    However, where I've always found some goodness with HDRx is when filming timelapse. Very useful for day and night as well as transition filming.

    That said, truthfully I don't use it much at all outside of that. It's still a nice and unique feature.
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  10. #10  
    Yes HDRx is one of the greatest features of the reds I think. I don't care what DR the camera has this function gives more and it´s always good to have more... Of most things.

    But also consider this. when doing 8k 10:1 you max out the bitrate flow. Same as 5:1 in single layer. If you use both layers I would say that you are not really compressing as hard as 10:1 two 10:1 mixed together can actually even be cleaner than one 5:1 layer. But sure if you do it without purpose and toss one track away in post then you wasted bandwidth.

    Simply two differently compressed image of the same scene blended can actually be cleaner than one half compressed image of the same scene.
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