Difference Between Mean and Median Stack Modes

Difference Between Mean and Median Stack Modes

Difference Between Mean and Median Stack Modes

There are several different stack modes in Photoshop, in this article we’re going to look at the difference between Mean and Median Stack modes. They’re both used for the same purpose which is to blend together multiple images to create a composite. As a result, they help reduce noise and enhance details by focus stacking. If there are moving objects in the frames you can remove them by selecting the correct stack mode, or make them really blurry by choosing the wrong stack mode.

Two of the most commonly used stack modes in Photoshop are the Mean and Median Stack Modes. They both produce very different results, find out how to use them and what the differences are in this quick video tutorial.

Difference Between Mean and Median Stack Modes

 

The Difference Between Mean and Median


Mean:

The Mean is the average. If you had 10 layers, 9 were red and 1 was blue, the mean would consist of 9 parts red and 1 part blue. When we have a detailed image this will soften the image as it will blend the colour of each stacked pixel to find the average colour tone and show us the average pixel. This works wonderfully if you want a soft long exposure type image. The downside is that any moving objects in any of the frames will be visible as a blur. 

Median:
The Median will give you the middle. Using the same scenario of 9 red layers and 1 blue layer. The middle value would be red as it far outweighs the blue, so you will only see red. With more detailed images whichever tone is dominant will show through, this is a great way to enhance detail and remove moving objects.

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Mean or Median for stacked Images

We used 9 layers to show how to stack and blend, and to show the difference between Mean and Median.

To get all of the images into Photoshop as layers we used Raya Pro’s stack function then uses Align to ensure the multiple layers were aligned.

1. Select the top layer then hold down the Shift key and click on the bottom layer to select all of the layers.

 

2. Right-click on one of the selected layers and choose Convert to Smart Object.

 

3. Once your layers have been converted to a Smart Object you should only now see one layer and the layer thumbnail should have the following icon on it.

photoshop smart object icon

 

4. Now go to the Layer menu, scroll down the list until you get to Smart Object and hover over it.

 

5. A new sub-menu will appear and near the bottom, you will find Stack Modes, when you hover over this you will see the different stack modes available.

 

6. To create a soft blended image, select the Mean option to stack your images.

 

7. For a sharper image choose the Median stack mode.

 


Here you will see the different effect that both stack modes have on the same image. Here is the original image.

Compared with images that have been merged using Mean and Median Stack Modes in Photoshop.

Difference Between Mean and Median Stack Modes

Difference Between Mean and Median Stack Modes

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Difference Between Mean and Median

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Difference Between Mean and Median Stack Modes
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