Is there a photographer who can answer this question? Can you explain in detail the different methods of setting white balance with whiteboard and gray board?

Whiteboard and grey board are used to set the white balance in the same way, and there is no difference. Theoretically, any neutral color can be used as a reference for white balance. The difference between gray board and whiteboard is that gray board can also be used as a reference for photometry.

It is very simple to set the white balance with a gray board or whiteboard. You can set the camera to a custom white balance, put the board in front of the lens, fill in the picture, and press the reference photo.

Or simply take a picture of the gray board or whiteboard, and click the board with a white balance straw when you return to RAW to decompress, and the correct white balance number will be displayed. Let's use this as the standard for PS photos.