黑白摄影用的感光材料,在曝光和洗印方面都有较大的宽容度。因此,即使曝光和洗印有些误差,也能获得较满意的效果。但彩色负片却不同,虽然在曝光和冲洗方面也有一定的宽容度,但是很小,尤其彩色反转片的更小,要求更加严格。彩色负片在某种程度上若曝光不足或过度,可通过增加或减少显影时间的方法来补救。 Photographic materials used in black and white photography, exposure and printing have a greater tolerance. Therefore, even if exposure and printing some errors, but also get more satisfactory results. However, the color negative film is different. Although there is a certain degree of tolerance in the exposure and the processing, it is very small. In particular, color reversal films are smaller and require more stringent requirements. Color negatives to some extent, if underexposed or over, by increasing or decreasing the development time to remedy.