need to fix the sky

[Martin Brennand]

It depends on the motion:

1. Is any part of the sky have texture detail in the clouds or is it too overexposed?
2. Is there any middle-ground scenery such as mountains?
3. Are the flowers moving a lot or are they stationary?

You can do sky replacment a number of ways (keying, rotoscoping etc) but for a dolly, you’re going to need a trackable background to make sure the sky solidly follows the movement of the camera.

Martin Brennand | Product Manager | Mocha – Boris FX (Imagineer Systems)

[Dorian Weber]

Hi Martin,

1. there are a little clouds still visible.
2. there are high rising buildings around
3. the flowers actually do not move (or hardly) but the dolly moves (slow) from left to right across

[Jim Arco]

You might want to try keying on the luminance of the overexposed sky. Then replace it with footage of a ‘prettier’ sky. You could probably even do that in Premiere.

Jim

[Dorian Weber]

But the problem is, the tulips move across the background sky.
Yes, if I could darken the sky and then color it, would make a big difference.
Any video tutorials on that?

[Tero Ahlfors]

[Dorian Weber] “But the problem is, the tulips move across the background sky.”

This shouldn’t be a problem unless, for some reason, the tulips are the same color as the sky. A screenshot or a videoclip would be helpful.

[Mark Suszko]

The gray sky is actually going to make luminance keying easier. One thing I would suggest is, using a 2-step process: make a separate layer of the track and push the brightness and contrast settings to make the sky as even white or gray as possible, and don’t worry that it’s spoiling the quality of the rest of the shot. All you want to get out of this layer is a clean matte.

Then you extract that matte by inverting it, and add it back to a “normal” layer of the tulips pass, and now with those two tracks wedded together, you can key in a bare blue gradient in only the spots where sky would have shown thru. To make that sky better, yes, you will have to add a tracker, then a layer with clues and blue sky.

Some folks will do this in a 3-d comp so they have more control of the angles of that sky shot.

[Richard Garabedain]

show us a screen shot of your video and we will tell you if its possible

[Dorian Weber]

not sure if this is the right way to post a video…. :
https://www.screencast.com/t/oYnpeFLhGV

[Dorian Weber]

oops, reply should be here….

https://www.screencast.com/t/oYnpeFLhGV

[Kalleheikki Kannisto]

Yes, definitely possible. In fact, should be pretty easy. The sky is very clearly separated from the flowers. I would mask the buildings, so that you just need to create a matte to separate the moving flowers and the tree from the sky. Probably one of the RGB channels will work well for that.

Important to choose a very wide angle sky image — you can see the horizon and the zenith at the same time, so this might be a 120 degree FOV — and match the perspective so that it looks like it belongs. Since it looks like it is windy, the clouds could be moving. With a still image of clouds I often use the slant effect and keep the horizon in place to create moving clouds. Or find or shoot a wide angle sky video to put in there.

Kalleheikki Kannisto
Senior Graphic Designer