负片制作放大照片这个概念进入摄影实际上是比较晚的事情,是逐渐发展起来的。在19世纪中后期,如果你想得到较大的照片,你就要用较大的负片拍摄。接触印像照片作为照相机曝光的最终产品一直延续到20世纪2、30年代。到今天,接触印像还是作试条的一种方法。 The concept of negative photo production enlarged photo into the photography is actually relatively late thing, is gradually developed. In the mid-to-late 19th century, if you want to get larger photos, you have to shoot with larger negatives. Exposure prints were the final product of the camera exposure until the 1920s and 1930s. To date, contact printing is still a way of making a test.