Noise reduction through smart object

In this tutorial, you will learn how to process evening and night photos taken with an ordinary inexpensive digital camera. Well, photos taken with a SLR camera can be almost completely rid of noise in this way.

The effectiveness of this method exceeds all known noise canceling plugins. The only condition: you need to shoot still objects, for portraits this method is not very suitable. Although … maybe there are enthusiasts, because at the dawn of photography, portraits were shot with excerpts of a few minutes!
So let’s get started.

Step 1. We make several shots of the object we need. In this case, it is best to use the burst mode in the camera (read the instructions for the camera). I made 10 shots, you can shoot more.

An inexpensive Canon Powershot A580 camera was used. Shooting was carried out with hands, the maximum sensitivity of ISO 1600 was specially established. Noise at this value literally filled the entire image. One of the frames is shown below.

Step 2. Go to the menu File – Scripts – Upload files to stack (File – Scripts – Load files into stack).

A dialog box will appear.

Click Overview To select the desired files, select your captured images and press OK. Check the checkbox Automatically align images (Attempt to automatically Align Source Images).

Now each image will open as a layer in one file.

The image came out of such a form, with transparent areas around the edges, as the shooting was done with the hands, and not with a tripod (for the purity of the experiment). These areas appeared as a result of automatic alignment of layers.

Step 3. Now right-click on the name of the top layer and in the drop-down list click Select similar layers.

Now you have all the layers.

Step 4. Right-click on the layers palette and select Convert to smart object (Convert to smart-object)

Now we only have a smart object in the layers palette. All layers will be inside it.

Step 5. Next in the menu Layer choose a team Smart Objects – Stack Mode – Median. (Layer – Smart objects – Stack mode – Median).

Since the noise of the camera matrix is ​​random, that is, different pixels are noisy from frame to frame, it is quite logical that noise can be reduced by averaging the sample values ​​of pixels from several images, and with a slight loss of image detail. What we see in the final picture. Further correction is at your discretion. Do not forget to just rasterize the smart object, otherwise many tools will become unavailable. This is also done by clicking the RMB in the layers palette and selecting the command Rasterize the layer.

To compare the effectiveness of this method, I cite a picture that I processed with the Noise Ninja plugin (one of the best plugins for dealing with noise).

I think, having studied this lesson, you will discover not only the new features of Adobe Photoshop, but also your camera.

I wish you all creative success!
Author: Evgeny Kartashov.

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