cineon 10 bit comp

[reuben]

hello

I am doing log based composting in c2.1 with cin format not many people know the correct process of this method so I am asking some help from all who use c2 and doing film based comp my files are cinoen 10 bit log

and my cg files are 8 bit linear from 3d

when I composit I am getting totally different look

this is how I am doing loading footage in 2k going to lut from workspace and changing to lut to 1

then changing the param to log to lin mind u I am not changing thru lut editor

but if I do and put the value which I am not sure say .450 rest all default then somewhat itscoming close can anybody throw some light as to how to go about it in correct way

I want to mentain all the highlight and full color information coz my output will be in log finally

using PC

thank you

reuben

[Chek]

If you make a log to linear LUT, when you render you can use the other LUT (linear to log) created by C*.

[JackP]

Hi...

I am going to TRY to "help" you... But, please be aware that I personally have NOT worked directly with Film and LUTs (Look Up Tables...) I used them ONCE in a Discreet Class I attended, but that's it! So, Quite honestly, I am a "video-guy" for the last 25 years, and NOT film....

However, since I do a lot of Combustion training, I have tried to educate myself on the essential basics, such that when my students ask me questions, I can at least try to provide semi-intelligent answers ...

As you may already know, the concept of LUTs applies to the problems faced by the conversion of 10 bit Log Film to 8 bit Linear or Video Data... Video simply does NOT have the color depth necessary to reflect color data. Therefore, an intermediate file, typically the industry standard "Cineon" file, is used. With video-based programs such as Combustion. the Cineon is imported and a LUT is used to best view the results and achieve a resemblance of color accurate viewing...

What are Cineon Files? The Cineon image file format is a subset of the ANSI/SMPTE DPX file format. Read More Here: http://www.cineon.com/file_format.php

There is an On-Line Technical definition of the Cineon file format here:
http://www.cineon.com/ff_draft.php

How do you convert 10 bit log images to 8 bit linear images? Answer: Read the lengthy article here:
http://www.cineon.com/conv_10to8bit.html

As for Combustion:

Basically, combustion 2.1 has "Film Tools" -- specifically grain, color management and LUTS.
The Grain and Color Tools are compatible with Discreet's other effects systems including flame and inferno. The combustion 2.1 add grain tools include settings for most common Kodak film stocks, as well as full parameter control for automatically matching to any film type used in production. combustion 2.1 can basically remove grain by using some pretty sophisticated math (algorithms) that reduce grain in an image, all without sacrificing image clarity.

LUTs: Combustion 2.1 has Look Up tables, which are a set of controls that describes specific pixel values to be used in image display or conversion. These tools provide controls on a per-footage level (histogram, separate RGB controls), as well as tools to preview results of LUT operations on the monitor without having to use external utilities. The LUT files are compatible with flame and inferno and support similar editing, import and export functions to generic ASCII LUT files.

Does this begin to help you??

If not, we'll have to get a "Film Guy" in here to answer any very SPECIFIC Questions you should post .....

Regards,

JACK

[Chek]

I've just done a test.
I work in film res since 2001
I made a lut:

10logto12lin.lut

reference white 215
reference black 25
highlight 255
shadow 0
gamma correction 1
film gamma 1.6
soft clip .250

When I work with various colour space at the top of my workspace I add a bit depth converter and I make the entire project 12bit linear.
So if I have to render in cineon format, I use imported lut (12linto10log - made directly from C* when I export my 10logto12lin) in its settings pannel.
that's all
I hope I helped you!
Bye



Hi...

I am going to TRY to "help" you... But, please be aware that I personally have NOT worked directly with Film and LUTs (Look Up Tables...) I used them ONCE in a Discreet Class I attended, but that's it! So, Quite honestly, I am a "video-guy" for the last 25 years, and NOT film....

However, since I do a lot of Combustion training, I have tried to educate myself on the essential basics, such that when my students ask me questions, I can at least try to provide semi-intelligent answers ...

As you may already know, the concept of LUTs applies to the problems faced by the conversion of 10 bit Log Film to 8 bit Linear or Video Data... Video simply does NOT have the color depth necessary to reflect color data. Therefore, an intermediate file, typically the industry standard "Cineon" file, is used. With video-based programs such as Combustion. the Cineon is imported and a LUT is used to best view the results and achieve a resemblance of color accurate viewing...

What are Cineon Files? The Cineon image file format is a subset of the ANSI/SMPTE DPX file format. Read More Here: http://www.cineon.com/file_format.php

There is an On-Line Technical definition of the Cineon file format here:
http://www.cineon.com/ff_draft.php

How do you convert 10 bit log images to 8 bit linear images? Answer: Read the lengthy article here:
http://www.cineon.com/conv_10to8bit.html

As for Combustion:

Basically, combustion 2.1 has "Film Tools" -- specifically grain, color management and LUTS.
The Grain and Color Tools are compatible with Discreet's other effects systems including flame and inferno. The combustion 2.1 add grain tools include settings for most common Kodak film stocks, as well as full parameter control for automatically matching to any film type used in production. combustion 2.1 can basically remove grain by using some pretty sophisticated math (algorithms) that reduce grain in an image, all without sacrificing image clarity.

LUTs: Combustion 2.1 has Look Up tables, which are a set of controls that describes specific pixel values to be used in image display or conversion. These tools provide controls on a per-footage level (histogram, separate RGB controls), as well as tools to preview results of LUT operations on the monitor without having to use external utilities. The LUT files are compatible with flame and inferno and support similar editing, import and export functions to generic ASCII LUT files.

Does this begin to help you??

If not, we'll have to get a "Film Guy" in here to answer any very SPECIFIC Questions you should post .....

Regards,

JACK