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CG(Computer Graphics)是指利用计算机硬件和软件制作的数字化图形、图像。随着数字化电视制作手段的普及,CG制作已经成为当今电视数字内容创作DCC(Digital Content Creation)不可或缺的手段。CG制作充分发挥了计算机系统的优势,制作快捷,便于调整,形式多样,效果丰富,而且便于数字化的存贮、传输。如今电视屏幕上形式多样、效果丰富的字幕、动画及特效无不展现了CG技术应用于电视制作的创造表现力。电视内容制作、播出、接收系统模拟与数字技术新旧并存的情况下,在制作阶段,电视节目制作人员利用计算机技术制作相关CG影像;在收视阶段,主流的终端用户通过电视接收机接收模拟电视信号观看影像。在运动影像的呈现方面,电视接收机屏幕与计算机显示器屏幕存在诸多技术上的不同之处,如呈现清晰度、扫描频率、色彩空间、显示区域和像素宽高比等,种种不同导致了两者图像呈现的差异性。考虑到最终收视用户的观看质量,电视节目制作人员在创作用于电视重现的CG影像时,应当充分考虑两者之间的差异,对CG影像进行针对性的优化处理。制作用于电视广播的数字视频时,连接到计算机的经过校准的PAL制视频监视器和示波器是精确预览的必要设备,通过它们我们可以掌控视频图像的质量。目前条件下,许多CG制作人员可能并不具备这样的监控条件,此时就应注意以下几方面的图像优化问题。
CG (Computer Graphics) refers to the use of computer hardware and software to produce digital graphics, images. With the popularity of digital television production, CG production has become an indispensable means of digital content creation (DCC) in today’s digital TV industry. CG production give full play to the advantages of computer systems, making fast, easy to adjust, in various forms, the effect is rich, and easy to digital storage and transmission. Nowadays, the diversified and colorful subtitles, animations and special effects on the TV screen all demonstrate the creative expression that CG technology is applied to television production. TV production, broadcast, receiving system simulation and digital technology coexist, in the production stage, the production of television programmers using computer technology to produce related CG images; in the viewing stage, the mainstream end-users through the television receiver to receive analog television Signal to watch the image. There are many technical differences between the TV receiver screen and the computer monitor screen in terms of presentation of moving images, such as sharpness, scanning frequency, color space, display area and pixel aspect ratio, Differences in image presentation. Taking into account the quality of the viewing of the final viewing user, the television program production staff should fully consider the differences between the CG images when they create a CG image for television reproduction, and optimize the CG images. When making digital video for television broadcasts, a calibrated PAL video monitor and oscilloscope connected to a computer are essential devices for precise previewing and allow us to control the quality of video images. Under the current conditions, many CG production staff may not have such monitoring conditions, this time should pay attention to the following aspects of image optimization.