The Shadow/Highlight command is one method for correcting photos with dark or dull images due to strong backlighting or correcting subjects that have been slightly washed out.The adjustment can also be used for brightening areas of shadow in an otherwise well‑lit image. The Shadow/Highlight adjustment that we are going to use is destructive in nature. So it’s better first to create a duplicate layer and then proceed. So press Ctrl+J/Cmd+J to duplicate your layer. Now go to Image>Adjustment>Shadow/Highlight. After clicking on Shadow/Highlights a new popup box will open which is loaded with two sliders i.e. Shadow and Highlight. To reveal more features, click on Show More.After clicking on Show More option your panel should look like this.        

  Bit Depth The word bit comes from two words, binary and digit. Bit depth refers to the color information stored in an image. Bit means it’s amount of tonal variation in the image. Understanding the tonal values within an image can help you obtain the best print possible. There are 3 type of bit depth on photoshop.  8-Bit Depth 8 Bit images have 256 colors.Each Color of an image in RGB (Red, Green, Blue) is created from a gradient from black to white. There are 256 shades of grey between Absolute Black and Absolute White. This means that Red has 256, Green has 256 and Blue has 256. The math is 256x256x256=16.7 Million Colors possible. 16-Bit Depth It is

White balance is the process of removing unrealistic color casts, so that objects which appear white in person are rendered white in your photo. White balance in digital photography means adjusting colors so that the image looks more natural. We go through the process of adjusting colors to primarily get rid of color casts, in order to match the picture with what we saw when we took it. Raw Image from freeimages.com Camera Raw Method :  Open your image in the Camera RAW editor then go Filter>Camera Raw Filter and select the “White Balance Tool” within the Tools bar at the top of the “Camera Raw” dialog box to adjust the white balance in camera raw images, click the “White Balance