How to brighten the background color of the picture if it is too dark?

Use Photoshop to darken the background image. There are several ways to brighten it:

The original effect is as follows:

Method 1: Open Image > Adjustment > Brightness/Contrast in the menu bar, and move the brightness slider to the right or the contrast slider to the left.

Method 2: Open Image > Adjustment > Curve in the menu bar, click the curve, add a point on the curve, and move the point to the upper left.

Method 3: Use the color code, and the shortcut key is CTRL+L. In the color code panel that pops up, move the output slider to the right.

Method 4: Open Image > Adjustment > Exposure in the menu bar and move the exposure slider to the right.