| Unsharp Mask | ||
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The Unsharp Mask filter is a simple method of sharpening a photo. Areas of complexity and fine detail within the image become crisp and better defined. An Unsharp Mask takes longer to perform than a simple Sharpen but gives more control and produces a more natural appearance.
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| Settings | |
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| How it Works | |
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An Unsharp Mask is essentially a Blur in reverse. A Gaussian Blur is applied to a copy of the original image to produce an image with no fine detail. The blurred image is subtracted from the original to extract the fine detail. This fine detail is then added to the original image to highlight complex areas. The radius parameter determines the radius of the Gaussian Blur
in pixels and lets you choose the level of scale of detail that
should be enhanced. The difference between color levels on the
blurred and original image is determined at each point on the
image. If the difference is greater than the Threshold parameter
then the Amount percentage of the difference is added back to the
original image. |
| Example | |
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The following example shows the basic effect of Unsharp Mask on a blurred photo and how the parameters can change the effect produced. Note that because JPEG compression has been used to compress these images some of the fine detail applied by the effect is not visible.
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The following examples show how the parameters can change the effect produced.
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