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Log vs. Linear
I’m having 16mm film scanned at 2k.
I’m told it is being scanned at 10 bit Log and not 10 bit Linear.
At home using my own software, is there anyway to check and confirm this?
Thanks!
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10 Replies
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Sure, if it looks milky, its log.
If you scope shows values (very roughly, mike, I know 😉 between 100 and 700 only , its log.
Or just make a jpg and post it, we can see.
Don trust the flag of the DPX file, its wrong 70% of the time .A slice of color…
DaVinci 8.0.1b3 OSX 10.6.8
MacPro 5.1 2×2,4 24GB
RAID0 8TB eSata 6TB
GTX 285 / GT 120
Extreme 3D+ WAVE -
Thanks Sascha,
Well it does look a bit milky, so that’s a good sign. And yes it is between 100 and 700… again good sign.
This does raise a question I have had though. I think I am correct when I say that 100% white on the IRE scale is 700.
But the waveform monitor on Resolve goes up to 1023. I can raise the gain on the image all the way up to 1023 without the image losing detail or “overexposing”… this confuses me a bit. It seems to me if I go over 700 I should be whiting out. (The image does not look nice over 700 though – it has a “too contrasty” look to it)
Or is happening because I am using LOG and just don’t understand how to color correct in the LOG world yet? 🙂
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My jpg didn’t post… I’ll try again:
It said Image Uploaded! But it was not included in my reply….
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Use that one :
https://www.roflsaurus.com/
The Cow one sometimes fails for me too.
Of course you can “stretch” the image to fill the video scale up to 1023.
That will make it look good because you extend it into the range your environment is set up.
If you want to deliver for web or TV, this is a way to start grading, just setting a proper black and white point.
People normally call that “linear” then, which is not the case if you look at true linear renders from Nuke for example.
https://prolost.com/blog/2005/1/26/color-correction-in-linear-vs-gamma-corrected-space.html
There is a lot to read about this topic, but the most important thing is, what do you need to deliver ?
That will define your next steps.A slice of color…
DaVinci 8.0.1b3 OSX 10.6.8
MacPro 5.1 2×2,4 24GB
RAID0 8TB eSata 6TB
GTX 285 / GT 120
Extreme 3D+ WAVE -
One thing I still don’t understand is why there is no log to lin lut in Resolve?
Anyone know where can I get one?Thanks!
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Thanks again Sascha!
My final output will mainly be DVD. But I also want a master DPX folder that can be converted to other things – depending what the future brings. Home projection, Streaming video, etc.
I obviously have a lot to learn. I’m slowly learning the actual practice of grading, but it’s the settings, standards, SMPTE Recommendations, etc. that I’m finding difficult to learn.
Regarding Gustavo’s question; I’m confused in this area too. If I’m going to grade in LOG space… at what point does Log get converted to Linear? And what LUT should I be using? Say for DVD release?
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I have just been passed my first log footage job – all 1080 23.98 prores files that are totally looking Log – this is the first time I have had to deal with footage of this nature.
I am actually using color for this job because it’s all te studio has but I am really not sure how to deal with creating the high contrast / saturated look they sent me for reference. Should I be using a lut of some kind – I believe it was shot on the Arri.
Delivery is for tv, web & in-instore (DVD)
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ok great thank you!
Let me just ask you this. If its assume that rec.709 is the format I will be grading in (on a flanders:) using apple color, what are the proper settings I should use and how best can I set this up in Color for grading?
maybe i should also make a proper post in the color format about Log & Lut’s – its my first ever so I want to make sure to handle this properly so as to be able to grade the quicktimes as best as possible.
thank you
sean -
Sean,
I’m actually not exactly sure what you’re asking. As far as I know Color doesn’t even have that many setup settings – what you see is what you get, as it usually is grading for video.
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