fit more than 5 times the amount of RAW video???

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greg fiske

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fit more than 5 times the amount of RAW video???

PostThu Aug 30, 2012 3:29 am

The specs say "Compressed HD formats fit more than 5 times the amount of RAW video." Does this refer to prores? Can prores be opened in a raw editor? Or is there an option to compress the actual dng file?

I'm trying to understand the difference between raw and prores. I'm assuming its like jpeg vs raw file? You loose the latitude (highlight recovery) and being able to change white balance (without loss in color data) with prores?
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Re: fit more than 5 times the amount of RAW video???

PostThu Aug 30, 2012 3:51 am

If you are recording compressed files, like ProRes, you can store about 5 times as long a shoot on a given SSD. So if shooting uncompressed CinemaDNG, you may get less than 30 minutes of video on your SSD compared to about 2 hours if you shot ProRes.

ProRes data is more gradable than a typical jpeg so not the best analogy in terms of colour quality. But for the sake of the comparison a TIFF file is to a jpeg, what a DNG file is to ProRes. When you record ProRes, you can select to record in two different initial forms. BMCC refers to these as ProRes Film and ProRes Video. All the 13 stops of potential dynamic range are retained in ProRes Film but it's a fairly flat looking image that takes some skill to bring to life visually. ProRes Video uses the Rec709 standard for recording video typically for broadcast in one way or another. You are going to lose some dynamic range because the highlights and shadows are somewhat squeezed which has the effect of increasing contrast and making the image visually appealing with less grading required generally speaking. If you are planning on delivering your video to broadcast or DVD on the internet, you likely would use ProRes Video. If you plan to distribute in a cinema, you would chose ProRes Film or better still CinemaDNG which will give you more control over what you can do with the grade. If part of your project involves keying and visual effects, you likely would shoot those scenes in CinemaDNG to get the best results.

I'm no expert in this, so if anyone wants to correct what I said, feel free.
Rick Lang

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