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practice upload

by: Ali Loftus

practice upload

Marketplace > University of Connecticut > > practice upload
Ali Loftus
GPA 3.87

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practice upload
Class Notes
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This 3 page Class Notes was uploaded by Ali Loftus on Thursday January 7, 2016. The Class Notes belongs to at University of Connecticut taught by in Summer 2015. Since its upload, it has received 18 views.


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Date Created: 01/07/16
Ainmiation Lab Chroma Keying Works with footage shot on a Green Screen (or Blue Screen) Useful for creating a traveling matte, that changes with our foreground subject Creating a Chroma Key Bring in footage Create your Composition Select your layer with the Green Screen footage Effect> Keying> Keylight (1.2) Grab eyedropper for Screen Colour and select the green color by your subject Keylight will process and knock out the green background We use green screening to be able to handle subtle detail and/or complex detail, that would be impossible to mask out. A Garbage Matte is a simple shape to isolate the important parts of our green screen subject to focus our key on. Creating a Garbage Mask Select the layer with your Green Screen subject Select the Pen Tool and draw a simple and rough mask around your subject Setting Your Garbage Mask for use in Keylight Open the properties for your Green Screen Layer Find your Mask Change the Mask from Add to None Go into your Keylight effects panel Find Outside Mask and open the property Click the drop down and select your mask Now click the invert checkbox right below How to view the Alpha Channel for your Key at the top of the Keylight Effects Panel open the view drop down select Combined Matte This will show you noise outside of your subject and transparencies inside you subject Another way to view this data in simpler way is to use the Status at the top of the Keylight Effects Panel open the view drop down select Status anything White is purely opaque anything Black is purely transparent anything Grey is some value of transparency anything Red is out of range of the Keylight Effect Lots of Grey shows noise issues that needs to be fixed To Fix the Noise in our Key To fix the noise in the Black areas When your make adjustment you need to keep in mind what detail you may be losing in the Keylight Effects panel Adjust values on Screen Gain this will trim out noise but removes too much, too quickly use very small values (default value is 100) open the properties for Screen Matte adjust the Clip Black values adjust the values up (toward 100) this will trim out the noise, but will also remove detail also To fix the noise in the White areas adjust the values for Clip White adjust the values down (toward zero) Eliminating Green Color from out subject Spill is when light is reflected off of the background and onto our subject results is a Green Color appearing on our subject Keylight will automatically adjust the color to remove spill If you would like to control that in the Keylight Effects panel use the eye dropper for Despill Bias and choose a color You might need to do this for hair (rarely use) If there is noise in any Black areas... Change the Replace Method to Hard Colour to clean it up To Remove Fringing around the Subject in the Keylight Effects panel find Screen Pre-Blur (blur image before applying key) raise value a bit to soften edge Under Screen Matte> Screen Softness (this will blur after keying) raise value a bit to soften edge Changing the value for Screen Shrink/Grow can help remove any fringing Keep these values low and negative to cut into your subject Also combining it with the Screen Softness helps Starts at 2:32


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