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Need Advice On Replacing Sky's

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Dave Williams
Need Advice On Replacing Sky's
on Mar 14, 2013 at 12:32:32 pm

I am currently working on some long format shows that usually are shot with the sky's being overcast, rainy or just plain gone! I have tried to put a touch of blue with a window whenever possible but that has it limits as sometimes things get in the way. I have about 1200 clips per show and have about 24 working hours to do them in.

Has anyone been able to do a key on a totally washed out sky, add some color and have it look realistic? I have tried this before and it just looks horrible. Any tips or tricks would be much appreciated.


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William Edwards
Re: Need Advice On Replacing Sky's
on Mar 14, 2013 at 2:54:22 pm

Try not to make a dramatic change, keep it simple. Sounds like they should have used a filter. Hard to say any ways of making it go faster, I'm sure each scene is different. Don't you think there's limitations to what can be done in the time allotted?


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Joseph Owens
Re: Need Advice On Replacing Sky's
on Mar 14, 2013 at 5:01:25 pm

[Dave Williams] "Has anyone been able to do a key on a totally washed out sky, add some color and have it look realistic?"
Yes, these days its an expectation.

The technique is usually a combination of Luminance-qualified secondary, erode/blur plus a power window to put some shape into the sky gradation. This gets a little tricky for material that is less than 10-bit, as banding will set in fairly quickly. You should save this operation as a node tree that you can append to a current grade, but also be prepared to do some tracking. Try not to do custom shapes, but mostly rely on the luminance qualification to provide a basic "shape" that you can feather, then shape with a boolean window operation.

Look at a natural sky and for the most part, you will see that horizon lines are less saturated than higher azimuths.

Otherwise 24 working hours for a 1200 event timeline doesn't sound that unreasonable for a seasoned colorist. That's what we used to get allotted for feature length intermediate transfers, including notching, film transport, viewing and loading/unloading reels.

jPo

"I always pass on free advice -- its never of any use to me" Oscar Wilde.


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andrew sableton
Re: Need Advice On Replacing Sky's
on Mar 14, 2013 at 11:19:49 pm

Yeah 24 working hrs is a lot of time..... I do 1300 shot TV shows in 8-10 hrs quite often....

Hue vs Hue and Hue vs Sat curves can sometimes work well for a quick isolation / manipulation of sky, in combination with pushing a bit of blue into the gain.... but all depends on a lot of specific properties of the shot and what you are trying to achieve....

AS


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