Open a photo with PS.
Click-Image-Adjustment-Decolorization.
Turn black and white after decoloration?
Copy the layer background on layer mask?
Click-Image-Adjust-Reverse
Effect after inversion
Change the layer mode to linear gradient? (The photo will turn white after changing to linear thinning)
Click-Filter-Blur-Gaussian Blur (adjust the blur radius to about 10- 15).
Effect of Gaussian blur
Click-Image-Adjust-Brightness Contrast (do brightness contrast, and finally save the picture).
Effect after saving