BRIGHTNESS & CONTRAST
Brightness is the amount of light that is available across the picture. Contrast is the difference, or the ratio, between the brightest and darkest parts of a photograph. To balance them, open the file in Photoshop and go to Images. Under Images, go to Adjustment and from there to Brightness/ Contrast. You can use the sliders to adjust the picture’s brightness and contrast to your preference.
Another way in which you can carry out the same task is to use Curves. Open the image and under Adjustment, click on Curves. Use the graph line to get the desired brightness and contrast. Remember that increasing the brightness reduces colour saturation and increasing contrast leads to higher colour saturation.
Both these methods will require you to practise a bit before you can correctly judge the best brightness and contrast. After that you can experiment with these two aspects not only to correct your image, but also for special effects.