Why is the shooting effect red with white background paper?

After you reflect light, the light ratio between the subject and the background is wrong. Results The contrast was low and the picture was transparent, but not clear.

As for red, it is the white balance of your camera.

solution

1. Measure the brightness of the subject and background with an exposure meter, and adjust the brightness of the lamp so that the light ratio of the subject surface to the background is about 25: 1.

2. Adjust the white balance with the color card to make the white paper white (if it is determined to be red, adjust it with red paper.