From the course: Photoshop CS5 One-on-One: Advanced

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Radius and Threshold

Radius and Threshold - Photoshop Tutorial

From the course: Photoshop CS5 One-on-One: Advanced

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Radius and Threshold

In this exercise I'm going to provide a detailed analysis of what's going on with the Radius and Threshold options inside the Unsharp Mask dialog box. This is one case where it really pays to know what's going on under the hood. That way you'll get more effective results out of Unsharp Mask. So in addition to this Macro butterfly .jpg image here, I've gone ahead and created a stripped down version of the image called Simpli-fly.jpg, also found inside the 15_sharpen folder. In this case, I've gone ahead and distilled the image down into just a few interacting colors here. That provides us with some very obvious edges inside the image, that the Radius value can glom onto. Notice also, if I zoom in on this image, that I've added a synthetic paper texture here using a couple of filters. We'll see how that works in the future chapter. That will allow us to examine what's going on with Threshold. So I'm going to go up to the Filter menu, choose the Sharpen command, and choose Unsharp Mask…

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