simple clean screen using IBK colour with un-premult

Written by satheesh R on .

Many of us using stack of IBK colour node with incremental of values to get clean Blue or Green screen.

Example below image:

Most cases 1 IBK color node will give good result. But in some shots we ended up stacking multiple IBK color node to get the clean screen(plate).

When use multiple IBK color node the script became slow, Each node takes more time to produce the result. How do we overcome this slowness ?!

Here is the alternate way:


I used blur and un-premult nodes to get the similar result. This is much faster then IBK color stacking.

Comparison of both method result:


Result looks similar. Some shots this method produced better result compare to IBK color stacking.

Final result comparison video

Here is the steps:

1. Denoise your plate.
2. Create a IBK colour node. Choose your screen type. Play with the values to get the fine result.
3. Add a premult after IBK colour.
4. Create a Blur node. Change channels to rgba. Enable mask to rgba and check invert. Check below image.

5. Add un-premult after the Blur node.
6. Add some value to the Blur size. Magic, all the blacks will start filling with your screen colour.

Original article:

More ideas are welcome. Thank you share this article if you think it's useful.



0 # iMan Javaherypour 2022-03-11 02:05
Thanks for the tip!

You have no rights to post comments

We have 2412 guests and 45 members online