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2. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   When selecting a raster image that is not rectangular, it requires separating the edges from the background, also known as silhouetting. This is the digital-analog of cutting out the image from a physical picture. Clipping paths may be used to add silhouetted images to vector graphics or page layout files that retain vector data.

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. Image embossing - Wikipedia

   en.wikipedia.org/wiki/Image_embossing

   Two different emboss filters are applied to the original photo. Image (a) is the result of a 5×5 filter with the +1 and -1 in the horizontal direction, which emphasizes vertical lines. Image (b) is the result of a 5×5 filter with the +1 and -1 in the vertical direction; it emphasizes horizontal lines.

5. Image segmentation - Wikipedia

   en.wikipedia.org/wiki/Image_segmentation

   Edge detection techniques have therefore been used as the base of another segmentation technique. The edges identified by edge detection are often disconnected. To segment an object from an image however, one needs closed region boundaries. The desired edges are the boundaries between such objects or spatial-taxons. [28] [29]

6. Edge detection - Wikipedia

   en.wikipedia.org/wiki/Edge_detection

   A typical edge might for instance be the border between a block of red color and a block of yellow. In contrast a line (as can be extracted by a ridge detector) can be a small number of pixels of a different color on an otherwise unchanging background. For a line, there may therefore usually be one edge on each side of the line.

7. Vignette (graphic design) - Wikipedia

   en.wikipedia.org/wiki/Vignette_(graphic_design)

   Rather than the image's edges being rectilinear, it is overlaid with decorative artwork featuring a unique outline. This is similar to the use of the word in photography, where the edges of an image that has been vignetted are non-linear or sometimes softened with a mask – often a darkroom process of introducing a screen. An oval vignette is ...