线性工作流及其在影视数字合成中的应用  

A research on linear workflow and its application in film and television digital compositing

作　　者：顾春华 王少云 秦尧 Gu Chunhua;Wang Shaoyun;Qin Yao(Film and Television Production Department of Shanghai Film Art Academy;Beijing Chroma Culture Communication Co.,Ltd)

机构地区：[1]上海电影艺术学院,上海201203 [2]北京策玛文化传播有限公司,北京101100

出　　处：《现代电影技术》2023年第7期10-17,25,共9页Advanced Motion Picture Technology

摘　　要：线性工作流是计算机图形图像领域不可回避的历史遗留问题,但其仍对影视视效制作流程有着深远影响。虽然线性工作流已在影视视效制作中广泛使用并频繁提及,但是人们对其原理和理解仍较为片面。本文全面而系统地介绍了线性工作流的本质原因、解决方案以及实施过程;以目前主流数字合成软件Nuke为例,示范了线性工作流在影视数字合成中的具体应用;同时,为了使视效制作各环节实现数字图像在亮度、颜色以及显示方面的高度统一,本文还介绍了学院色彩编码系统(ACES)相关知识。虽然线性工作流不易理解和掌握,但其保证了整个图形图像制作流程色彩管理(亮度)的正确性。希望本文能够有助于视效从业者加深对线性工作流的全面理解,加强对影视数字合成中线性工作流的规范使用。Linear workflow is a remnant problem in computer graphics,but it still having a profound impact in post⁃produc⁃tion.Although linear workflow has been widely used and frequently mentioned in post⁃production,the scientific introduction to linear workflow in the visual effects is still relatively incomplete.This paper systematically introduces the essential rea⁃sons,solutions and its implementation process of linear workflow.Based on foundry Nuke compositing software,this paper details the linear workflow in Nuke software and digital composition.Meanwhile,in order to achieve the unanimity in bright⁃ness,colour gamut and display of digital images in various stages of visual effects production,digital artists also need to know more about ACES.Although the knowledge of linear workflow is difficult to be fully mastered,linear workflow ensures the correctness of colour management,especially the brightness in the entire graphics and image production process.This paper is composed to help digital artists getting a deeper understanding of linear workflow,strengthen the standardised use of linear workflow in film and television’s daily work basis.

关 键 词：线性工作流 伽马校正 数字合成 视效 Nuke 

分 类 号：J916.2[艺术—电影电视艺术] TP181[自动化与计算机技术—控制理论与控制工程]