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2. Acutance - Wikipedia

   en.wikipedia.org/wiki/Acutance

   In digital photography, onboard camera software and image postprocessing tools such as Photoshop or GIMP offer various sharpening facilities, the most widely used of which is known as "unsharp mask" because the algorithm is derived from the eponymous analog processing method. In the example image, two light gray lines were drawn on a gray ...

3. Edge enhancement - Wikipedia

   en.wikipedia.org/wiki/Edge_enhancement

   Edge enhancement is an image processing filter that enhances the edge contrast of an image or video in an attempt to improve its acutance (apparent sharpness).. The filter works by identifying sharp edge boundaries in the image, such as the edge between a subject and a background of a contrasting color, and increasing the image contrast in the area immediately around the edge.

4. ImageMagick - Wikipedia

   en.wikipedia.org/wiki/ImageMagick

   Decorate: add a border or frame to an image. Special effects: blur, sharpen, threshold, or tint an image. Animation: assemble a GIF animation file from a sequence of images. Text and comments: insert descriptive or artistic text in an image. Image identification: describe the format and attributes of an image. Composite: overlap one image over ...

5. Comparison gallery of image scaling algorithms - Wikipedia

   en.wikipedia.org/wiki/Comparison_gallery_of...

   The resulting image is larger than the original, and preserves all the original detail, but has (possibly undesirable) jaggedness. The diagonal lines of the "W", for example, now show the "stairway" shape characteristic of nearest-neighbor interpolation. Other scaling methods below are better at preserving smooth contours in the image.

6. Sumo Paint - Wikipedia

   en.wikipedia.org/wiki/Sumo_Paint

   Sumopaint, also written as Sumo Paint is a free painting and drawing web application similar to Adobe Photoshop. [1] [2] [3] Sumopaint has web-based "paint" features similar in some respects to Pixlr. [4] It was originally created in 2008 by Sumo Limited. [5]

7. Unsharp masking - Wikipedia

   en.wikipedia.org/wiki/Unsharp_masking

   Unsharp masking applied to lower part of image. Unsharp masking (USM) is an image sharpening technique, first implemented in darkroom photography, but now commonly used in digital image processing software. Its name derives from the fact that the technique uses a blurred, or "unsharp", negative image to create a mask of the original image. The ...