Log Adjust And Lookup Correction

[fxnurbs]

Hi,

I am going to work with film footages and i try to find the right process.
I am ok with the lin log but not with the display.
I some tutorials i found that i had to change the rNgamma and the rDgamma to 1
the picture looks okay, but i don't know if i am close of the real final projected picture.

We have an other workstation with combustion who have a lut preset for film
I know that i have the lookup in shake but i don't find the utility to use is because i can correct my picture look with the gamma, so what is the best way ?

i read somewhere that i had to change to black and white point on my settings,
by default in shake they are 95 and 685, some tell that changing that to 0 and 1023.
ok, ok, what is the better way ? if i do that and check my histogramm, there is a little change between the in and out picture and without changing the black and with (only the gamma) my histograms are the sames

conclusion :
I think i just have to find the good settings in the linlog node (do the same at the end) and don't use the lookup.

if people have experience with, please help me.
Thanks

[fxnurbs]

Ok, nobody seems to work with log files

I saw with the lab who don't send me the LUT that (in this case) he must to correct the settings i use.
So for me, remap the black and white point to the ones its sent me.
I will tell more when i will know more.
It is a mess

jaz

[user_deleted]

You are asking some big questions here !

Do not use a lookup IF you need to convert your footage. Use a logLin node.

Many people do lots of things in log space and simply use a viewer LUT. If you are not compositing CGI into your plate or doing keying on any hardcore colour work. Then it is fine to keep the shot in log.

I some tutorials i found that i had to change the rNgamma and the rDgamma to 1
the picture looks okay, but i don't know if i am close of the real final projected picture.

Unless you know exactly why you are doing it, do not change the rNgamma and the rDgamma settings. As stated in the manual the the 1.7 value is a peice of legacy code from the sgi days and actually converts data to 1.

i read somewhere that i had to change to black and white point on my settings,
by default in shake they are 95 and 685, some tell that changing that to 0 and 1023.
ok, ok, what is the better way ? if i do that and check my histogramm, there is a little change between the in >and out picture and without changing the black and with (only the gamma) my histograms are the sames

Depending on the method for compositing your footage you probably wont need to change the black and white points in the logLin either. I am not sure how you are using a histogram, its quite possible that you are actually clipping data and it is not visible in your viewer.

conclusion :
I think i just have to find the good settings in the linlog node (do the same at the end) and don't use the >lookup.

simple solution calibrate your monitor. Buy eLin for shake (not the after Effects version).

http://www.redgiantsoftware.com/elin.html

http://prolost.blogspot.com/2005/02/using-...n-floating.html

Composite in Float. that way you can be sure that you are not clipping data.

Most importantly speak your lab and confirm the process you are using. They should eb able to offer heaps of help,