Two factors that cause the image to become black as a whole:
1. The overall blackening of the image caused by poor image contrast, can adjust the monochrome C, M, Y, K curve, the light part is reduced, and the dark part is increased.
2. The overall blackening of the image caused by the single K curve can be solved by reducing the light part of the single K.

1. It can be solved by adding the dark part of the single K curve.
2. Excessive interception of four-color ink will cause the overall image to be gray

1. Use photoshop to view the original image C, M, Y, K mixed density, adjust the three-color and four-color total ink volume upper limit in the color management.
2. The maximum amount of ink that the paper can withstand, the ink absorption capacity of the paper, and the diffusion or siltation of the ink will cause the loss of image hierarchy.

1. When you print a solid color block with ICC, you will find that there are dots of other colors in it, which causes the place where one dot was originally printed, but now it becomes two or three dots, which will cause the face to be not delicate enough. Suggest The user uses the CUV curve to print, but the color expressed by the CUV curve is not as good as the ICC
2. The degree of fineness is also related to the color registration of each color. In the case of inaccurate color registration, the image will be rough when the dots are scattered.
3. It is also related to the different materials used

Poor contrast will affect the overall effect of the image, causing color loss, and some details cannot be shown when printing certain images.

For example, the light part is too light, then the light part of the image may be lost, and the original color cannot be seen. If the dark part is too deep, the dark part may become unclear.

Insufficient saturation will cause the whole picture to be gray when printing some brightly colored images, so the saturation of a single color must be achieved when cutting ink. However, if the ink is not cut in order not to affect the saturation, it will also cause some problems, such as ink sludge.