1. First open the ps software, select File-Open (shortcut key ctrl+o), and find the photo you want to process.

2. After opening the material file, select the layer where the material is located, and ctrl+J copies the layer. Then operate on the copied layer.

3. Select "Copy Layer" and press ctrl+M to pop up the curve panel. Adjust the nodes of lines in the curve panel, adjust the bending degree of lines, and change the brightness of the picture. You can also enter a value directly. In the output and input boxes, then confirm.

4. At this time, you can see that the brightness of the photo of the material has been obviously compared with the previous picture. At this time, we will deal with it a little, adjust the hue saturation, CTRL+U, and look at the changes in the photo of the certificate while adjusting it. After a little adjustment, it will be confirmed.

5. Finally, we can see that the skin color of the processed photo is very obvious compared with the skin color of the initial photo in step 1. (pictured), just look at the photo of the certificate and save it as it is.