Advanced Keying Breakdown: MERGING 3.1 – Premulting, Overs, Addmix, & CCs

Explaining Premultiplicaiton and unpremultiplication. Breakdowns of Over and Addmix, and tricks to gamma the alpha before overing. Also at the end, talking about the importance of unpremulting before color corrections (wrong and right ways to do CCs).

This tutorial uses basic colors with a transition to teach these merging techniques and the math behind them. The math and techniques are the same for complex images and alphas, but I felt it was easier to demonstrate this way. If you are bored by the beginning sections (they can be a bit basic), I’d highly recommend skipping ahead to the “gamma-ing the alpha before an over” section. I Hope this de-mystifies some complex concept of merging images, and how to use the addmix tool.

Should be 1 more tutorial left (with a possible bonus to the despill section), presenting a template script and explaining how I have put together all of these concepts we have discussed in order to bring a full key together.  This includes tips and tricks to getting around common problems in keying, despilling, and merging.  I hope to have this to you guys soon.

0:00 Intro
2:01 Multiplying (how alphas are applied, premult and unpremult)
4:56 Adding
5:47 Over – Breakdown (math explained)
8:28 Overing an unpremultiplied image
10:21 Overing a double premultiplied image
13:42 Gamma-ing the Alpha before an Over
18:36 Gamma-ing the Alpha (practical example)
19:56 Addmix Breakdown
26:41 Addmix Techniques
30:25 Unpremulting before Color Corrections
42:03 Outro

Thanks for all those that are watching and learning.  I am really glad I can help.

Cheers,

Tony Lyons


5 thoughts on “Advanced Keying Breakdown: MERGING 3.1 – Premulting, Overs, Addmix, & CCs

  1. Your tutorials are great, do you any tutorials for season changes, I am trying to make a fall to winter season changes in a shot i am working on. I started to change it with hue node but im having a hard time with it. Do you know a good way to do it or tutorials that could help?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s