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  06 June 2004

hi.. i'm now working for a movie which vfx are to be done in DF4.... the live footages are in cineon format.. i need to add 3d elements with these footage and compose it...

could anyone help me in the conversion of cineon log to linear in DF4?

which method should i follow to match the cg elements?
  06 June 2004
I'm sure other's may have different ways of working with cineons, but I for one, have worked on a few projects this way now, and it has worked well for me.

Under version 4, DF now handles float color space, and will retain all the color information retained in the cineon file. Load the footage as normal, and then set the image LUT (right click on the display) and set it to a gamma of 1.7 or 1.8.

Now while working like this, just be sure to occasionally turn on the "show full color range" button in the display to make sure your highlights and shadows match the plate.

Others may argue that you should leave the cineon import as bypassed, but this can adversly effect things like color manipulation and alpha channel operations, as DF is designed to work in linear space.

Another technique would be to get the LUT's from the scanning facility and apply that on the import of the cineons. I say just let DF do all the work.

Try to render your 3D as 16 bit tiff, or float if you have the drive space. This will then allow you a lot of room to color correct later. You can always render 8 bit, and then force it to float with the change depth tool, but that may contain banding coming from just 8 bits initially.
Jason Kolodziejczak
Digital Fusion Consultant
Toronto, Canada
  06 June 2004

hi jay... thanks fro ur reply... often i get reply from u for all of my queries!! thanks again...

as for now.. i'm using this method...

1.loading the cin file...

2.adjust the softclip parameter to 89

3.and the conversion gamma to 1.7

this works well... as both highlights and shadows are retained...
  06 June 2004
Just be aware that there are a few caveats to this method.

1) if you are keing material from blue or green, setting the conversion gamma to 1.7 can alter the soft regions, and produce halos. You're better off leaving the conversion gamma at 1, and adjusting the display gamma.

2) By adjusting the soft clip, I believe you are limiting the conversion to a 16 bit image file (But I could be wrong on this... I can't check at the moment. )

But if it's working for you, stay with it. I find the best method of dealing with cineons is finding a workflow that you know, and can produce consistant results with.
Jason Kolodziejczak
Digital Fusion Consultant
Toronto, Canada
  06 June 2004
Isn't it better to be keying in linear space as opposed to log?
Hugh Macdonald
  06 June 2004
<JAY2K2> ya...ofcourse i'm working with cineon 16 bit footage... scanned image files are in 16 bit itself.. so as u mentioned, adjusting soft clip will bother?? if u dont mind i may send u the flow with cineon images..

<HUGH> Keying in linear rather log will affect color depth...right?
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