Sharpen your images using the High-Pass filter in Photoshop
Photoshop CS’s high pass filter is very versatile, and in this tutorial we show you how it can be used for sharpening images
Sharpening is always the last step in post-processing. This is because the amount of sharpening you need to apply varies according to how you intend to use the photo. Using the High Pass Filter is an easy, simple and effective way to sharpen your images, particularly before sending them to print.
1. Open your image in Photoshop
2. Copy your image by selecting the background layer and pressing Ctrl + J
3. Go to Filter > Other > High Pass
4. Set the radius
5. Go to Image > Adjustments > Hue/Saturation… and set the Saturation to zero. This eliminates any colour fringing
6. Change the Blending Mode to Overlay
Here you can see the difference after sharpening. You may have to look closely to see the difference – the unsharpened photo is on the left and the sharpened one is on the right. The level of sharpening is often subtle. If you introduce too much, then artefacts become noticeable in the image, seen as lines marking the edge of a dark subject against a light one, such as the horizon. If you want to add more sharpening, you can always add another layer and repeat the process.