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Premultiply and Unpremultiply Demystified
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Premultiply and Unpremultiply Demystified

$29.00

A complete and correct software agnostic description of the premultiply and unpremultiply operations, the math behind them, and when and where to use them.

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SKU: WB-PremultUnpremult Category: Webinars Tag: color
  • Description
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Description

Premultiply and Unpremultiply Demystified

In less than an hour we will demystify premultiply and unpremultiply .

For years visual effects artists have been confused about the premultiply and unpremultiply operations, and for good reason. The names are confusing, the math is weird, and many of the explanations out there are incomplete, incorrect, or both. This webinar addresses all of these issues and more.

In this software agnostic webinar Steve will explain and demonstrate the math, workflows, and case studies for applying the premult and unpremult operations to visual effects compositing, editing, and color correction. Never again have dark or discolored edges in your work due to a mis-application of the premult / unpremult operations.

This webinar provides a complete and correct explanation of the premult and unpremult operations, when and where to use them, and how to avoid dark edges.

Duration –under one hour

 

 

Course Outline

Premultiply and Unpremultiply Demystified

  1. The Math
    1. why the confusing name “premultiply”
    2. demonstration of premultiply math
    3. demonstration of unpremultiply math
    4. CGI premultiplied pixels
    5. keyed images premultiplied pixels
    6. avoiding double premults
    7. the 3 states of premultiplication
  2. Workflow Demonstrations
    1. avoiding color correction premult artifacts
    2. avoiding colorspace conversion premult artifacts
    3. avoiding filtering operation premult artifacts
    4. how to work with “straight color” CG renders
  3. Case Studies
    1. Photoshop files’ dirty little secret
    2. effects of double premult on CG, graphics, and text
    3. premult behavior test image for any app
    4. the effects of colorspace on premult / unpremult ops
  1.  

Recommended Reading

 Available now at amazon.com

Digital Compositing for Film and Video

4th edition

by Steve Wright

A very popular book on the theory and practice of digital compositing.

This book has become a steady machine-side companion for even the most serious compositors.  It contains encyclopedic knowledge of digital compositing plus it addresses real world production problems and provides their solutions.

Featuring new content on powerful new keying techniques, ACES and ColorIO, working in linear and VR Stitching.

If you don’t have a copy yet, purchase it today at amazon.com.


 
Includes Exclusive Web Content!

 

The web content for this book can be downloaded by visiting the publisher’s website (https://routledgetextbooks.com/textbooks/9781138240377/) to request access to the book’s resources. To get your access token you must have proof of your purchase of the hard cover, soft cover, or an electronic version.

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Our Textbook

“The ideal guidebook for every compositor.”

Digital Compositing for Film and Video

Production Workflows and Techniques

5th edition

by Steve Wright

This book is required reading in our mentored compositing courses.
Order yours today at amazon.com   

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