![]() It looks for edges in the image and highlights them. And High Pass is an edge-detection filter. But what does that have to do with Photoshop's High Pass filter? Well, before we can increase contrast along the edges, we first need to find those edges. So sharpening an image is all about increasing edge contrast. Why is the High Pass filter great for image sharpening? The more we boost edge contrast, the sharper the image appears. Your brain then interprets the increased contrast as "sharper". Increasing contrast along the edges makes the light side of the edge lighter and the dark side darker. Photoshop considers an edge to be any area where there's a big, sudden change in brightness between neighboring pixels. It works by increasing contrast along the edges in your image. ![]() Much like a good magic trick, image sharpening is an illusion. To understand why Photoshop's High Pass filter is so good at sharpening images, it helps to understand how image sharpening works in general. I'll be using Photoshop CC but everything you'll learn is fully compatible with Photoshop CS6.Äownload this tutorial as a print-ready PDF! What does "image sharpening" mean? You'll learn how to find the best settings to use with your image, and I'll show you how to apply the High Pass filter non-destructively so you can sharpen your image without making any permanent changes. In this tutorial, I'll explain what it means to sharpen an image in Photoshop, and why the High Pass filter is such a powerful sharpening tool. But the High Pass filter is also great for sharpening images, and it's much easier to use, with none of the confusing options you'll find with those other two filters. When it's time to sharpen an image, most Photoshop users turn to one of two sharpening filters, either Unsharp Mask or Smart Sharpen.
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