A lack of light is the enemy of any photographer and, in certain situations, it may force you to bump your ISO far higher than you're comfortable with. The resulting visual noise in the image can render it unusable. Unless you follow this tutorial from PiXimperfect, that is.
As Unmesh Dinda shows, using Photoshop’s stacking tools can help you reduce, or even eliminate, all that awful noise and rescue your image.
The key, though, is to recognize during the photographing process that you do not have enough light, and to make sure that you take many photos of your subject. Obviously, using a tripod is the ideal method for taking photos that you are going to later stack, but as Dinda points out, if you are able to stabilize your camera, or even your smartphone, reasonably well by hand, you can still make this work. Photoshop’s powerful alignment tool will allow you to line up images that aren’t precisely the same due to small movements of your hands or body. However, if you change the angle of your lens relative to your subject, it will negate Photoshop’s ability to align the images, so make sure you keep your camera at the same angle. Once inside Photoshop, the process is fairly simple and straightforward using the “mean” stacking tool.
This technique is great for low light situations in which you are unable to use a flash, or even for astrophotography. Have you used image stacking to reduce noise in your images? Drop a comment below and let us know how it worked for you.