Sharpening: Enhancing Edge Definition
Sharpening is a technique for increasing the apparent crispness of an image by enhancing the contrast along the edges within the photo.
Digital sharpening doesn’t actually “fix” a blurry photo; it simply creates the illusion of focus. By making the light side of an edge lighter and the dark side darker, the brain perceives more detail. For example, after downsizing a high-resolution photo for a website, a “Smart Sharpen” is usually applied to restore the detail lost during the compression.
Frequently Asked Questions
Despite the name, it is a sharpening tool. It uses a blurred (unsharp) version of the image to find edges and then increases their contrast.
Halos are white or dark lines that appear around edges when an image is over-sharpened. They are a sign of poor processing.
Always sharpen AFTER resizing. Resizing usually softens the image, so sharpening should be the very last step in your workflow.
A popular method where you apply a High Pass filter to a duplicate layer and set it to “Overlay” to sharpen only the fine details.
Sharpening will also “sharpen' your noise, making grain and digital artifacts much more visible and distracting.
Yes. Images usually require more sharpening for print than for screen because ink “spreads” slightly on paper, which naturally softens the image.
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