ARRI ALEXA Log C ProRes 4444 in CS5

[Alex Udell]

I’m assuming that you simply want to view it as correct color, but not change that data itself?

That would mean a view LUT of sorts….hmmmm

anyone?

Alex

[Jan Janowski]

Here’s what I’ve been able to determine, as a combination of Tweak by eye, and mathematics…..:

First… I have to do a multiply of .818 on Fast Color Corrector Input master gamma to get rid of the famous Quicktime gamma push…
That get’s gamma corrrect.
Then, using Black and Gain Input side of Fast Color corrector, I change master blacks and gains to get contrast back to “normal”. Now Blacks Gammas, and gains are OK… Then I increase Saturation…
That gets me 98% of the way there…

Problem is, there is a Subtle (What I think is) Matrix error.. The picture is ever so slightly green… I then do a HSL adjustment slightly magenta (Equal but opposite)… That gets me nearly perfect…
However I believe the green error is only in green gamma, so using a overall HSL Magenta adjustment gives me OK gammas, but very very subtle magenta blacks and whites… That’s why I think it is a Matrix error…. Whether this comes from Quicktime or the conversion from RGB to YUV I’m not sure….
I’ve got it to the point where a man on a fast galloping horse wouldn’t know there’s a problem, but I’d certainly want to make it more perfect….

That’s where I’m at now….

Looking for 1939 Indian Motocycle

[Alex Udell]

Jan..

Yeah I was hoping to avoid actually having to process the footage with fx…

and just setting up a view LUT so that the data is preserved, but viewed accurately…

still checking on this…

Alex

[Alex Udell]

looks like ur method is the way to go for now.

Alex

[Jan Janowski]

It took me a while, but I finally got the email of the shooter…
I forwarded him details of what I did, and request for information regarding a conversion, and a request for test patterns from the camera.. Maybe via test patterns from the camera I can determine mathematically what the Black, White, and saturation settings should be within Fast Color Corrector input settings, and maybe (Wishful thinking–we are talking about Quictime wrapped footage here–you know!) minimize or eliminate the what I believe is a matrix error.. the subtle green cast……

I don’t believe PPRO supports LUT’s.

Looking for 1939 Indian Motocycle

[Jan Janowski]

I forwarded to the shooter Pics of before and after…
He says I’m doing good…

The one thing I wish I had would be a Black reference and a White reference…. So as to set my input blacks and Whites. And… some sort of color reference “Make this 100% staturated” or the like…

I’d like to be able to start with as close to perfect Black, Gamma, White, and Color Saturation settings…. and if it then needs to be tweaked.. So be it..

Looking for 1939 Indian Motocycle

[Jan Janowski]

OK, I believe I have good settings….
I tried both Fast CC and RGB CC and I believe I’m getting better results with RGB CC
Here are my settings for Overall black gamma gain and saturation:

Fast CC
Input adjustment only
Saturation: 200%
Input Black: 26
Input Gamma: .8 (I put in .818–.8 is all that displays)
Input Gain: 134

RGB CC
Use Master Tonal Range Only
Pedistal: -.05
Gamma: .74
Gain: 2.83
No Saturation settings needed.

I seem to be getting better subtle color differences using RGB CC.

Looking for 1939 Indian Motocycle