1. Sign on white paper with a pen, and take digital photos with a camera or scanner, as shown below:
2. Open the photo in PS.
3. Select-Color Range-Select Red-Parameter 200 (specific parameters depend on the situation) is as follows:
4. Copy-Paste-Delete the background layer, as shown in the following figure:
5. Store in PNG format.
6. use. Open the picture to be signed-File-Place-Place the signed PNG picture-Resize and position, as shown below: