2. Then click File → Open on the menu bar to open the picture to ps.
3. After opening the picture, click Image → Mode → "CMYK Color" in the menu bar.
4. After clicking the above steps, a new window will pop up to confirm whether to continue the operation. Click OK, and then click "Channel" on the right menu to find several colors of this picture.
5. Click Edit → Convert to Profile in the menu bar.
6. After clicking, a new window will pop up. Click the drop-down button in this line of the configuration file.
7. After clicking the drop-down button, the option will pop up. Select "Customize CMYK ..." to pop up a new interface.
8. Click OK.
9. In the new interface, click "Black Version Generation" → "Max".
10, the "total ink setting" is changed to 400, and the rest remains unchanged. Click "OK" in the upper right corner.
1 1. Click it and a new window will pop up. Continue to click OK → OK.
12, that's it. See the effect.