How to do local staining of ps background?

Use the lasso tool or pen tool to select the area, and then feather it, otherwise it will be difficult to come out. Then the method 1 can create a new layer, fill it with the color you want, then change the layer blending mode to color or positive overlay, and then adjust the transparency of the layer. Method 2: After selection, use Image-Adjust-Tone. The third method is to select the area you want, that is, select and use the image-adjustment-color balance.