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黑白照片中的放大制作过程在很多情况下用单一的局部加光处理或局部遮挡是不够的。由于拍摄时的光源造成底片反差太大,或者是题材的需要,在照片制作时要进行局部加光同时也要做局部遮挡的处理。采用这种手法是为了使放制好的黑白照片在影调、层次、反差等各方面达到最佳效果。 放制黑白照片时,首先要考虑底片的反差,根据底片的反差大小选用中性还是硬性的黑白放大相纸,如果底片的反差偏大,放大制作时既要做局部加光也要做局部遮挡。
The magnification of a black-and-white photo production process in many cases with a single local light processing or partial occlusion is not enough. As a result of filming the light caused by the negative film is too large, or the subject of the need to make a photo in the local plus light but also to do partial occlusion of the treatment. This approach is used in order to produce a good black and white photos in the tone, level, contrast and other aspects to achieve the best results. Placing black and white photos, the first film to consider the contrast, depending on the size of the negative selection of neutral or rigid black and white enlarge photo paper, if the contrast of the negative film is too large, .