介绍了数字电影后期制作过程中视觉效果质量控制方面的问题,分析了制作环节视觉效果的影响因素,并提出了实用的测量方法和仪器.同时为了建立一个有效的模型来比较不同媒体图象记录和复现的视觉效果质量,还讨论了不同设备的图象复现能力和特性,以曲线确定而非简单公式转换等一系列非线性因素.对每种因素和设备的调整参数采用由软件计算出来的查找表.并开发出一个适用于数字电影制作工作室设备校准、系统调试和图象质量测量的视觉效果管理系统.

This article presents problems coming out with the aspect of visual effect quality control of the digital film making process. The various factors contributing to effects of visual quality during image reproduction from analog to digital and from digital to analog are analyzed and the practical methods and instruments to measure them are introduced. To construct an effective model for comparing the visual effect quality of images recorded or represented on different media such as film, videotape, hard disk and monitor, we separate a series of functions, which reflect the abilities and characters in image reproducing of different devices. Those non-linear functions are identified as curves that can not been converted into simple formulas precisely. Referring to the Color Profile System used in desktop press industry, we adopt lookup tables for each function and device. Those lookup tables represent the characters of each device and the cross-influence are calculated by software. Based on the studies of those lookup tables, we developed a visual effect management system for digital film making studio, which combines the device calibration, system adjustment and image quality measurement together to parallel the digital film making procedure.