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在制片过程中,生片鉴定极为重要。本文简要介绍彩底、彩正有关涂布质量和照相性能的鉴定方法。一、彩色底片的鉴定彩底直接用于拍摄景物。鉴定生胶片的方法是:每轴号胶片抽一本,最好是抽该轴号的中间几本。将外圈撕掉3米后,取10米左右拍成灰片、冲洗,分别测出蓝、绿、红三层的密度,要求总密度在1.10左右。通过银幕放映,凡属涂布弊病者,如闪光、变色、静电、漏光、气泡、色斑、摩擦灰雾等就易暴露。对于照相性能,一般要做感光度、平衡反差、感绿层反差、宽容度和灰雾等五方面的鉴定。做法是:取2米左右生片印制三条光楔,按制造厂推荐的加工时间作适当延长或缩短时间的试验,然后测出三组
In the production process, identification of green sheets is extremely important. This article gives a brief introduction of the methods for the identification of coating quality and photographic performance. First, the identification of color negatives Directly used for shooting scenes. Identification of raw film method is: pumping a film per axis, it is best to draw the middle of the shaft number. After the outer ring was torn off 3 meters, take about 10 meters into a gray film, washed, were measured blue, green and red three-layer density, the total density of about 1.10. Screen through the screen, where the coating defects, such as flash, discoloration, static electricity, light leakage, bubbles, stains, friction fog easily exposed. For photographic performance, generally do sensitivity, balance contrast, perception of green contrast, tolerance and fog identification of five aspects. Practice is: Take about 2 meters of green film printed three wedges, according to the manufacturer’s processing time for the appropriate extension or shortening of the time test, and then measured three groups