数字中间片的制作及其意义(英文)

The Importance of Digital Intermediate And Its Production

目前数字中间片(DI)已逐渐取代电影洗印厂制作的传统中间片。在制作DI时,图像扫描成DPX文件格式。扫描仪感应的是底片的透光率,扫描所需的空间分辨率高于输出格式的空间分辨率以避免图像失真。DI有2种不同的图像编码方法;一种是用DPX文件,它表示的是底片密度,预览画面需要显示LUT;另一种方法是直接显示图像数据,在记录到胶片上之前,图像数据需要转换成密度值。记录到胶片上时,记录仪应降低M状态的红色格码值数据。如果将印片密度正确转换,则由数字中间底片印制的正片将与原底片印制的正片是相同的。本文较详细地叙述了DI的制作。

Digital Intermediate （DI） is gradually replacing the traditional intermediate made by the Laboratory. When producing DI, the original image is scanned as DPX files. A scanner interacts with the film transmittance and scans the image with a higher spatial resolution than that of the output format to avoid aliasing. There are two dif- ferent ways for image encoding in the DI process. One uses DPX files which represent negative film densities. A dis- play LUT is required to render a preview of the image. The other way is to directly display the image data. The data needs to be converted into density values before being recorded into the film. And the recorder has to reduce the red gamma data of Status M during recoding. If the printing densities are correctly converted, a print from the DI will exactly match a print from the original negative. The paper describes in detail the importance of DI and its production.