LOG vs. LINEAR vs. LUTs vs. Math: Battle ROYALE!!!!!

LPowell

Downloadable sample of GH4 V-Log-L footage, shot in 4K at 24p, recorded with internal 8-bit H.264 encoder:

https://drive.google.com/file/d/0BzXpNy2MdkE6N19Ld0h6c2Qyems/view

Here's a screenshot of a sample frame, along with its waveform. Notice the black pedestal at 10 IRE and the highlight peak at close to 79 IRE, both consistent with V-Log-L proper exposure guidelines:

driftwood

10-bit V Log L pre and post 'Varicam Log to Rec709.lut' from the beta.

balazer

V-Log -> linear, exposure comp., linear -> Rec.709

As best I can tell, that banding is present in the 8-bit source file. It's worse in the first second: I skipped past that.

and my previous V-Log L test images

Vitaliy_Kiselev

@driftwood @balazer

It is not V_Log test topic (until you specify some properties, numbers and such you want to discuss or show), check title and first post.

Also, Nick, please use Flickr for large files.

zcream

For this discussion, SI-2K log is output = Log base 90 (input*89+1).

http://cineform.blogspot.in/2007/09/10-bit-log-vs-12-bit-linear.html

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