Photography Tutorials

Polarizing Filter

Follow this newly discovered method of simulating a polarizing filter with Adobe Photoshop that’s faster, easier, and more effective. Considered the most useful filter in Photography, a polarizing filter makes almost any image look better by absorbing glare to reduce or eliminate reflections and darken skies.

Understanding how this polarizing effect works

Step 1

Download and save the following JPG file to your computer then open it inside Adobe Photoshop.

vancouver.jpg 204.46 Kb (Right mouse click> Save As)

Step 2

Once you have the photo opened inside Adobe Photoshop, look inside the Channels pallet (Window> Channels). Inside the Channels pallet, click on the each of the channels and notice the differences between the channels.

Comparison of the Red Green and Blue channels

So the red channel’s characteristics are similar to those characteristics of a polarizing filter (reduced reflections and darker blue skies & green vegetation), but how do we apply those characteristics to the image? In the next page, we’ll teach you a fast and effective way of simulating a polarizing filter.

Applying the Polarizing Effect

To apply the characteristics of the red channel into the entire image, we need to replace the luminance of the entire image with the image from the red  channel.

Step 3

Open an image you would like to work with or use the vancouver.jpg file we still have opened in Photoshop.

vancouver.jpg opened with Photoshop

Step 4

Duplicate the current layer (Layer> Duplicate Layer or Ctrl+J).

Step 5

Go in to the Channels pallet (Window> Channels) and click to select the Red channel.

Red channel selected

Step 6

With the red channel selected, create a selection of the canvas (Select> All or Ctrl+A) and copy the selection to clipboard (Edit> Copy or Ctrl+C).

Red channel selected

Step 7

Before we paste the red channel into the Lightness channel, we need to convert the image into Lab Color (Image> Mode> Lab Color). When it asks “Changing modes can affect the appearance of layers. Flatten image before mode change?”, select Don’t Flatten.

Lab Color

Step 8

Go in to the Channels pallet (Window> Channels) and click to select the Lightness channel.

Lightness channel selected

Step 9

Paste (Ctrl+V) the red channel that you have copied in your clipboard. The Lightness channel should be replaced with the image from the Red channel.

Red channel pasted into the Lightness channel

Fixing Reds

Because we took data from the red channel and used it as the luminance of the image, the lightness of the reds are not correct. We can’t really fix this so what we’re going to do instead is simply mask out the effect from the areas that are red. This causes the effect to only visible on areas that are not red.

Step 10

Now that we’re done with applying the image from the red channel into the lightness channel, we can change the image mode back to RGB color (Image> Mode> RGB Color). When it asks “Changing modes can affect the appearance of layers. Flatten image before mode change?”, select Don’t Flatten.

Step 11

Select the top layer and add a layer mask (Layer> Layer Mask> Reveal All). Click on the thumbnail of the layer mask to ensure it has been selected.

Layer Mask added to Layer

Step 12

With the layer mask selected, use the Apply Image tool (Image> Apply Image) with the following properties:

  • Layer: Background
  • Channel: Red
  • Invert: Checked
  • Blending: Multiply
  • Opacity: 100%

The Apply Image tool

Step 13

If you feel that the effect is too strong, you may reduce the opacity of the top layer to adjust the strength of the polarizing effect. To increase the effect, simply duplicate the top layer (Layer> Duplicate Layer or Ctrl+J).

Adjusting the opacity

Final Results

Darker Blue Skies

Reduced Reflections

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