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This tutorial takes a different approach to low light photos. Since capturing the moment is very important, my tutorial focuses on adding no additional prep time to your photography. You will shoot as you usually do, with one small difference, you will press and hold the shutter button, instead of quickly releasing it, the rest of the work can be done at a later time.
What you will need:
Often we will find ourselves needing to take a still image, in a low light situation, with no available way to stabilize the camera for a long exposure low ISO image. This all usually means that we take high ISO photos which end up grainy.
Lucky for us, there is a way to decrease image noise, and improve detail. Since smartphone cameras have gotten faster in terms of how many images they can take per second, it is possible to take multiple properly exposed, high ISO images, and then use mean stacking to improve the effective SNR in the image.
Best of all, it requires no extra prep time to do, just about all of the work takes place in post production.
While this process is simple to start, there are some limitation, it is very forgiving to horizontal and vertical shifts in an image, as well as minor perspective shifts as a result from hand holding. This process will not work if the scene itself is constantly changing.
1: To start, open your favorite camera app (anything that does burst shooting will do fine). Most camera apps will do burst shooting is you simply hold the shutter button down.
2: Take a picture as you normally would, but instead of pressing the shutter button once, and releasing, keep it held down, and the phone can quickly do a burst of 20 or more images if needed.
I will supplement the text, with a video demonstration of this process.
1: Copy the burst of images that you have taken, to a folder on your PC.
2: Import all of the images as layers (Adobe bridge makes this process simple)
3: Ensure that all of the images are aligned. If you took a picture of a person, who moved slightly during the burst shot, and background elements are out of focus, then the image can be aligned around the person, as out of focus elements are more forgiving to misalignment.
4: Crop away any transparent parts of the image that appear after aligning the photo.
4: After aligning the layers, we can now proceed stack them.
5: Now we can proceed to find the mean of the stack.
6: You are now done, save your now noise free image.
You should now have a cleaner high ISO image, without the motion blur that comes from a long exposure.
While there are many low light tips for smartphones, which rely on low ISO, and long shutter speeds, the setup for this, often requires many additional steps to be taken before you actually snap the photo. Whether you are moving to a wall to lean on in order to reduce shake, or using a weighted grip in order to reduce the faster small movements which come from hand holding, they all get in the way of taking the image in a timely manner, and for spontaneous moments, you simply do not have the time to prepare all of that.
By making use of the simple tip of burst shooting, you start shooting immediately, thus you are less likely to miss the moment, and since you are burst shooting, if you need less noise and more detail, you now have the option to do a mean stack, and improve the image. Furthermore, if for any reason, you decide not to do through with the mean stack, you at least captured the moment, and did not risk missing it by finding a location to prop the camera on, or finding a structure to lean on, and still risking a ruined image from motion blur.
I attached full resolution, un-cropped images of the before and after for those who want to pixel peep.
PS, this process can also be made into a macro if you would like to automate it for multiple burst shots. Just be sure to set the crop to be based on transparent pixels when you make it.