Color Transforms among Video, Computer Graphics,
Film, and Digital Cinema

In association with 2003 Tech Retreat

Description

Post-production professionals today deal with imagery originated in video, computer graphics, film, and digital cinema. Conversions among these media are required for many projects. Tone scale and color properties of each of these media has been designed based upon assumptions concerning ambient illumination, contrast ratio, color range (gamut), and other factors. To achieve good image quality, it is necessary to understand these factors, and to understand some of the mathematical aspects of transforming from one color space to another.

This seminar introduces the science behind image digitization, tone reproduction, and color reproduction in the domains of studio video, computer-generated imagery (CGI), film, and digital cinema (D-cinema). The course covers the following topics:

• Nonlinear image coding ("gamma correction")
• Rendering intent: Why it is necessary to depart from mathematical linearity to achieve subjectively acceptable images
• Explanation of the math behind additive and subtractive color reproduction
• Why the RGB of one system doesn't necessarily match the RGB of another
• Gamut and contrast ratio issues
• Logarithmic image coding (e.g., Cineon and DPX)
• Introduction to color measurement and monitor calibration; explanation of color measurement instruments (including densitometers, colorimeters, spectrophotometers, and spectroradiometers)
• Introduction to Color Management Systems

Materials provided: Attendees will receive a copy of Charles Poynton's new book, Digital Video and HDTV Algorithms and Interfaces. In addition, course note handouts will be provided.

Registration: USD 200. Register through HPA; contact Hollywood Post Alliance Executive Director, Eileen Kramer at +1 626 799 1733

Charles Poynton - Courses & seminars
www.inforamp.net/~poynton/notes/events/
2003-01-17