Even with the best equipment and expert techniques, we sometimes still end up with images that could be sharper. That is why almost every photo editing software provides a “Sharpen” feature. For example, Photoshop has no less than 6 different “sharpen” filters on my last count.
While we hope that getting a sharp picture will not be a problem when using a sharpening software, we know that’s not always the case. Unless your image has a very small blur, existing software “Sharpen” functions do not work well.
Now let’s go into a technical explanation about how a given software sharpens your images. Up until now, the photo sharpening tools in software typically use one of two type methods: image filtering or deconvolution.
The first type of sharpening is Image Filtering. The basic idea is simple: blurry images lack spatial high-frequency components. Therefore, applying a filter that boosts high-frequency will make the photo look sharper. Generally, this technique will works for photos with just a little blur. Since this method is fast, most software sharpen tools use this method. In Photoshop, “Sharpen”, “Sharpen More”, “Sharpen Edge” and “Unsharp Mask” all use this type.
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