To test paint colors without painting the wall using Photoshop, follow the steps given below:
- Import a picture of your room that you want to color
- Outline the wall area using Polygon Lasso tool
- Open the color palette and then choose White color
- Select the lasso layer and press Ctrl + Del
- Set the layer type to Color
- Right click on the lasso layer and select Color Overlay
- Change the Blend mode to Multiply
- Now just tap on the color palette and change the shade.