What is CTP positive plate

In fact, the CTP printer can directly print CTP negative plate or CTP positive plate, and the printing effect is basically the same. Only in the process of developing, the negative plate flushes out the unexposed position, while the positive plate flushes out the exposed position. Why? Because the exposure position of the negative plate is the position of the image and text, it needs to be reserved when developing, and the exposure position of the positive plate is the blank position, which needs to be washed out. Therefore, when 1-bit TIFF is used to import CTP, it is necessary to select whether to use negative or positive image to import the exposure. The Yin chart needs to be imported for the Yin chart and the Yang chart needs to be imported for the Yang chart.