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2. Kernel (image processing) - Wikipedia

   en.wikipedia.org/wiki/Kernel_(image_processing)

   For example, attempting to read a pixel 3 units outside an edge reads one 3 units inside the edge instead. Crop / Avoid overlap Any pixel in the output image which would require values from beyond the edge is skipped. This method can result in the output image being slightly smaller, with the edges having been cropped.

3. 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 ...

4. 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.

5. Comparison gallery of image scaling algorithms - Wikipedia

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

   One of the simpler ways of increasing the size, replacing every pixel with a number of pixels of the same color. 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 ...

6. Python Imaging Library - Wikipedia

   en.wikipedia.org/wiki/Python_Imaging_Library

   PIL offers several standard procedures for image manipulation. These include: per-pixel manipulations, [7] masking and transparency handling, image filtering, such as blurring, contouring, smoothing, or edge finding, [8] image enhancing, such as sharpening, adjusting brightness, contrast or color, [9] adding text

7. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   Image sharpening: original (top), image sharpened (bottom). Another form of image sharpening involves a form of contrast. This is done by finding the average color of the pixels around each pixel in a specified radius, and then contrasting that pixel from that average color. This effect makes the image seem clearer, seemingly adding details.