FXPHD – NUK240 – The Art and Science of Green Screen Keying, Part 2

从绿屏中拉出一个键是任何合成器的基本技能之一，但只有最熟练的艺术家才能创造出将提取的绿屏元素与其他 CG 图层整合在一起的错觉，使其看起来像是在同一时间，相同的相机和镜头，在相同的灯光下。对于合成器来说，除了绿色像素和 Alpha 通道之外，还有更多可看的东西。绿屏或蓝屏的制作需要精细的艺术眼光和方法论的思维方式。

Victor Perez 教授设计了这门由两部分组成的课程，旨在教您 Nuke X 中所有可用的键控工具，以及如何使用它们作为真正的专业人士来拉动钥匙。在课程的第二部分中，Victor 以第 1 部分中学到的理论为基础，深入研究如何使用这些工具并展示如何在 Nuke X 中获得出色的键。“绿屏键控的艺术和科学，第 2 部分”包含超过五个小时的指导以及录像文件（我们的高级会员提供）。

本课程涵盖的主题：

溢出和颜色
• 去溢出算法和表达式
• 抠像器内的去溢出：Keylight
• 色相校正和抑制
• 屏幕亮度恢复
• 背景相对亮度恢复

非 Alpha 高级键控
• 高频通过
• 加性键控
• 叠加键控
• VKeyer®

后处理遮罩操作
• 扩张/侵蚀滤镜
• 中值矩阵
• 模糊和渐变组合

合成绿幕元素及其光质量
• “美”遮罩（完美像素精确键）
• 光质量与边缘密度
• 运动模糊问题
• 半透明区域的背景相对亮度
• 光辐射对边缘表面的物理性质
•光晕和眩光
• 反射和非 Alpha 绿屏区域融合方法
• 边缘​​融合
• 纹理恢复
• 颜色分级：谁是参考

Duration Project Files Included MP4

Title: FXPHD – NUK240 – The Art and Science of Green Screen Keying, Part 2

Info:
Pulling a key from a greenscreen is one of the basic skills for any compositor but only the most skilled artists can create the illusion of the integration of an extracted green screen element with other CG layers to make it look like it was shot at the same time, with the same camera and lenses under the same lights. For a compositor there is more to see than just green pixels and an alpha channel. The elaboration of a green screen or blue screen requires both fine artistic eye and a methodological mindset.

Professor Victor Perez has designed this two-part course to teach you all the available keying tools in Nuke X and how to use them to pull a key as a real pro. In part two of the course, Victor builds upon the theories learned in Part 1 and dives into using the tools and showing techniques on how to get great keys in Nuke X. ‘The Art and Science of Green Screen Keying, Part 2’ contains over five hours of instruction as well as footage files (available with our premium membership).

Topics covered in this course:

Spill and Color
• Despill Algorithms and Expressions
• Despill within Keyers: Keylight
• Hue Correction and Suppression
• Restoration of Screen Luminance
• Restoration of Background-Relative Luminance

Non-Alpha Advanced Keyers
• High Frequency Pass
• Additive Keyer
• Multiplicative Keyer
• VKeyer®

Post-Processing Mattes Operations
• Dilate/Erode Filtes
• Median Matrix
• Blur and Grade Combo

Compositing the Greenscreen Element and Its Qualities of Light
• The ‘Beauty’ Matte (Perfect Pixel Accurate Key)
• Light Qualities vs Edge Density
• The Motion Blur Issue
• Background-Relative Luminance Against Semitransparent Areas
• Physics of Radiation Of Light Against Edge Surfaces
• Bloom and Glare
• Reflections and Non-Alpha Greenscreen Areas Fusion Methodology
• Edge Blend
• Grain Restoration
• Color Grading: Who is the Reference