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PNG is a raster graphics format. PNG has advantages over SVG including smaller filesize (due to less-than-optimal server-side SVG-to-raster conversion), more widely supported and often easier and faster to make simple changes to things such as borders.
The "voids-and-cluster" method gets its name from the matrix generation procedure, where a black image with randomly initialized white pixels is gaussian-blurred to find the brightest and darkest parts, corresponding to voids and clusters. After a few swaps have evenly distributed the bright and dark parts, the pixels are numbered by importance.
The width (thickness) of the border (default is 1px). style The border's style solid (default if the parameter is not used), dotted, dashed, double, groove, ridge, inset or outset. style2 Additional CSS properties can be used in this template. color The border's color (default #ddd, otherwise recommend a named color).
Date/Time Thumbnail Dimensions User Comment; current: 15:32, 18 December 2006: 1,475 × 1,200 (439 KB): Andrew c: 15:30, 18 December 2006: 1,475 × 1,200 (434 KB): Andrew c: Took Image:Europe countries map.png through photoshop to up the border contrast, and remove the color, then used Illustrator to vectorize.
It helps the user to distinguish the selection border from the image background by animating the border. The border is a dotted or dashed line where the dashes seem to move slowly sideways and up and down. This creates an illusion of ants marching in line as the black and white parts of the line start to move.
Recursive flood fill with 4 directions. Flood fill, also called seed fill, is a flooding algorithm that determines and alters the area connected to a given node in a multi-dimensional array with some matching attribute.
The term dither was published in books on analog computation and hydraulically controlled guns shortly after World War II. [1] [2] [nb 1] Though he did not use the term dither, the concept of dithering to reduce quantization patterns was first applied by Lawrence G. Roberts [4] in his 1961 MIT master's thesis [5] and 1962 article. [6]
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.