September 23, 2014 at 7:45AM

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Do you know difference between RAW uncompress and RAW compress?

I Want know this information for work better. Thanks

11 Comments

Thanks Tom.

September 24, 2014 at 2:50AM

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Ragüel Cremades
Film producer and director
7594

ok, so with lossless compression the quality it's the same?

September 24, 2014 at 6:18AM

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Ragüel Cremades
Film producer and director
7594

Typically You will always lose something when dealing with compression. Lossless or not.

If the compressor gives you a quality % slider the quality of the image will go down. even if your eye cant perceive the difference.

Usually the color fidelity is the first thing to go, say from a drop from 4:4:4 to 4:2:2, or 4:2:0.

http://www.red.com/learn/red-101/video-chroma-subsampling

September 24, 2014 at 2:31PM

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David Sharp
Video Editor, Cinematographer, Teacher
398

Thanks David.... :D

September 25, 2014 at 2:56AM

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Ragüel Cremades
Film producer and director
7594

Most RAW is lossy and has a compression rate. A tangible example of this is REDCODE when dealing with .r3d files. You can have 3:1, 8:1, 11:1, etc. and these are all rates of compression. Almost all RAW cameras have this compression it just usually isn't an option. I'll try and find my source, but I've heard that the Blackmagic cameras have something like a 3:1 compression rate for RAW. What I'm curious about is whether or not this is because of recording limitations or output limitations. For instance, FS700 RAW 3GI out to O7Q - whats the compression rating there? Would the bottleneck be the output from the camera or the recording limitations of the O7Q?

September 25, 2014 at 1:10PM

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Aidan Gray
Director of Photography Assistant Camera | Gaffer
1472

Tom, RAW just means sensor data, not pure untouched sensor data. It just means that the image processing has not taken place yet and what is being recorded is not video, but pre-debayered sensor information. It can have horrible compression and still have no baked iso or white balance.

September 25, 2014 at 3:46PM, Edited September 25, 3:46PM

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Indie Guy
1218

ive definitely noticed some things showing up i n more compressed r3d files such as color space shrinking, occasional artifacts in fast motion.
i try to keep this number down as possible. 2:1 - 3:1 is kind of a sweet spot

September 26, 2014 at 12:51AM

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Kazu Okuda
Filmmaker
1321

Yeah, the code of red have compression after all. A good compression but not RAW like Ryan said.

September 26, 2014 at 2:43AM

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Ragüel Cremades
Film producer and director
7594

Raguel here is your answer.
http://www.hdvideopro.com/technique/miscellaneous-technique/formats-expl...

Zazu, Red doesn't even have 2:1 actually I've never heard of a camera with 2:1 definitely not Black Magic, Sony, or Canon. The sweet spot is 7:1 on Red.

September 26, 2014 at 11:25AM

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Indie Guy
1218

Thanks Ryan.

September 27, 2014 at 2:50PM

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Ragüel Cremades
Film producer and director
7594

Thank you very much for all the information. I wasn't clear on this either. I am currently learning about photography and I came to RAW shooting and editing, and I found great help in this guide http://www.paintshoppro.com/en/pages/camera-raw/ on camera raw editing, but I wasn't sure what it actually is and what the difference between RAW format and others is, so thank you.

February 15, 2017 at 11:33AM

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