Lesson #08 IBK Colour

Today´s lesson is about how to do a nice CleanPlate using the IBK Color Node.

For improving your Key you need a CleanPlate of your Green / BlueScreen. Or Keying Properly with the IBK Gizmo you need this CleanPlate too.

You can get a nice and good CleanPlate within a few clicks. But even if this looks so easy a real CleanPlate should be preferred in any way as you get here better Key results.

By pressing TAB and then typing IBKColour you get your tool for this lesson. At this point we see in the spelling that “The Foundry” is a UK based company.

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Just plug your IBK Colour Node into your Plate.

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You see I did a highly professional green screen. Almost evenly lit and almost free of folds.

While looking at our parameters at IBK Colour we find following sliders

As we start setting up our values we work from top to down.

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Screen Type: Obviously we set at screen type our Screen Colour whether Blue or Green. In our case green.

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This is how our image looks after selecting the proper screen type.

Size: This value is about our size of colour expansion. If you get with a higher colour expansion value, you will have a lower value for your Patch Black to fill the Black areas. But you will loose image quality espacially in fine areas like sharp folds.

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here you see a 100% crop with two different size settings. Just Note how much more detail you have at size 1, and how much you loose at Size 10.

Later we will get to Patch Black, this value will help you fill up your Black holes. Let´s see  now what here is the difference between Size 1 and Size 10

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I used the same Patch Black value for different Size values. At size 10 my black holes are filled up completely but at size 1 there is still a big amount of black inside the body. But you should try to keep the Patch Black as low as possible as it can affect your clean plate details around your Foreground edges negatively. Let´s se at an example.

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Just note how much more folds and details we have within our PatchBlack = 4 version, and how much information gets lost in the 40 version.

Size Conclusion: I always try to set up my Size at the detail level of my Green /  Blue Screen. If it´s sharp as in your case here I would try to go forward with a lower Size value. If I would have a Screen which is already out of Focus and very blurry I would continue with a higher size value.

Darks and Lights:

With this values we try to separate our screen colour and our Foreground. As an ideal result we will only be left with our screen and our Foreground gets completely black.

This image is before changing any values at Lights and Darks. Size is set on 1.Image

I start with my dark values by changing the value of my screen type. Green for Greenscreen and Blue for Bluescreen. And I push it so long as my screen starts getting black holes or the black starts eating up my screen from the corners.Image

Note how the Foreground got black, I lost the colour within the jeans and the baseball cap but it is a little bit way too much as it is already black an the bottom of the screen.

As you set up your ideal Green Dark Value continue with Dark Red and Dark Blue.

The continue in the same order with the Light values.

As result you will get something like the following.

Tip: Sometimes it´s good to do multiple IBK Colours with different settings each one for different parts of the screen.

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Erode:

If you still have artifacts of your foreground colour increase this value to eliminate these colours.

As example look down at the feet at this 100% crop there so see some blue from the jeans and some grey from the socks.Image before

Image after Erode = 9

Patch Black:

Use Patch Black to fill your Black areas with the screen colour. As I mentioned above try to leave this value as low as possible. You can use a simple Garbage matte to lower your value because of filing up inside areas with a roto.

And now your done, your final IBK Colour Cleanplate will look like this

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