How to find the best Radius value for image sharpening But increasing the Radius value to 10 pixels would extend the highlighting outward to include 10 pixels on either side. In other words, a Radius value of 1 pixel would mean that the High Pass filter is highlighting only a single pixel along either side of an edge. The Radius value affects the width of the edge highlighting by controlling the number of pixels extending outward from the edge that should be included and highlighted as part of the edge. It then looks for edges in the image (areas with an abrupt change in brightness between neighboring pixels) and highlights them by making the light side of the edge lighter and the dark side darker. High Pass works by filling the entire image with flat, neutral gray. To follow along, you can use any image in need of some sharpening. So now that we know that sharpening an image means increasing contrast along the edges, and that Photoshop's High Pass filter detects those edges, let's learn how to sharpen an image with High Pass! Once the edges are highlighted, we can then combine the High Pass results with one of Photoshop's contrast-boosting blend modes to easily increase edge contrast without affecting other parts of the image! How to sharpen images in Photoshop with High Pass 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. You can get the latest Photoshop version here.ĭownload this tutorial as a print-ready PDF! What does "image sharpening" mean? I'll be using Photoshop CC but everything you'll learn is fully compatible with Photoshop CS6. 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. To use the ‘Screen’ mode, simply create a new layer and fill it with white.When it's time to sharpen an image, most Photoshop users turn to one of two sharpening filters, either Unsharp Mask or Smart Sharpen. This mode will take the lightest pixels from your image and blend them with the pixels underneath. You can then change the blend mode of the layer to ‘Screen’ for an instant light overlay.Īdding a light overlay in Photoshop is a great way to add some extra dimension and interest to your photos. In the gradient map settings, choose ‘Invert’ so that the gradient goes from white to black. To do this, create a new layer and go to ‘Layer > New Adjustment Layer > Gradient Map’. This will create a gradient of colors based on the lightest and darkest pixels in your image. So, if you’re going to use a light overlay, be sure to experiment with the opacity until you find the perfect balance for your photo.Īnother way to add a light overlay is to use a gradient map. However, it’s important to be aware that too much light can actually make your photos look washed out and uninteresting. PRO TIP: How Do You Add a Light Overlay in Photoshop?Īdding a light overlay in Photoshop can be a great way to add some extra light and interest to your photos.
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