4444xq16bit vs RAW12bit?

Mon Jan 28, 2019 3:26 pm

Hi everybody, I was wondering why 4444xwproress(UHD) format of Alexa mini is 16bit, and RAW is just 12bit(2.8k). I attach a photo made in davinci, any suggestions ?

Thanks!
Eduzzz89
 
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Re: 4444xq16bit vs RAW12bit?

Tue Jan 29, 2019 12:10 pm

Hey!

I don't see any screenshots attached but I'll take a guess and say that Resolve is reporting the container bit depth as opposed to what's inside it. 12bit data in a 16bit container.

"Apple ProRes 4444 XQ: Like standard Apple ProRes 4444, this codec supports up to 12 bits per image channel and up to 16 bits for the alpha channel."

Best,
Last edited by Igor Barbosa on Wed Jan 30, 2019 11:33 am, edited 1 time in total.
Igor Barbosa
 
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Re: 4444xq16bit vs RAW12bit?

Tue Jan 29, 2019 3:14 pm

Igor Barbosa wrote:Hey!

I don't see any screenshots attached but I'll take a guess and say that Resolve is reporting the container bit depth as opposed to what't inside it. 12bit data in a 16bit container.

"Apple ProRes 4444 XQ: Like standard Apple ProRes 4444, this codec supports up to 12 bits per image channel and up to 16 bits for the alpha channel."

Best,

Let’s suppos that, it means that Alexa mini RAW capture 12bit depth image ?
I attach the still of davinci
Eduzzz89
 
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Joined: Sun Jan 27, 2019 3:06 pm

Re: 4444xq16bit vs RAW12bit?

Wed Jan 30, 2019 11:56 am

ARRIRAW is encoded (but not captured) in 12-bit log, yes.

Just had a look into Resolve, and as I thought, it is showing 16 bit for 4444XQ as that is what it can 'hold'; 12 bit image data + alpha, which is not used in our cameras.

Best,
Igor Barbosa
 
Posts: 23
Joined: Wed Mar 23, 2016 3:07 pm
Location: London

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