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Sometimes, you find a drawing or similar image useful for a Wikipedia article, that was saved as a JPEG but should have been saved as a PNG.JPEG is good for images where the color changes fluidly throughout the image, like in a photograph, whereas PNG files are good for images with relatively few colors, such as a drawing of a flag, a chart, or a map; note that sometimes SVG is better.
Concept: Combine a lower precision reliefs (use lower sources or blur it) with a hight quality one, so the major feature appears more compare to the usual overload of small details. ("Avoid chartjunk/overload"). GIMP > open shaded relief NAME.ext > GIMP > Image > Scale image > Check pixel size, Resize to 20% of its size > Save as NAME-20%.ext
Note: This optimization applies to small scale maps covering a large terrestrial and mountainous zone for which the excess of details obscures the reading of the general relief forms. Reduction of the size of the image 1. In GIMP, open the png shaded relief image previously created. Note its dimensions in pixels.
GIMP: The GNU Image Manipulation Program is a popular open source software available for Linux, Windows, and macOS. While it has fewer features, GIMP can be compared to Photoshop. While it has fewer features, GIMP can be compared to Photoshop.
Dodge and burn change the lightness of the pictures, inspired by the dodging and burning performed in a darkroom. Dodging lightens an image, while burning darkens it. Dodging the image is the same as burning its negative (and vice versa). Dodge modes: The Screen blend mode inverts both layers, multiplies them, and then inverts that result.
In GIMP 2.8, the Convert Image to Indexed Colors Option (Image→Mode→Indexed..) allows generation of an optimum palette with a choice in the number of colors from 2 to 256, the option of using a web-optimized palette, using a black and white palette (1 bit) or using a custom palette. It allows unused colors to be removed from the palette and ...
The GNU Image Manipulation Program, commonly known by its acronym GIMP (/ ɡ ɪ m p / ⓘ GHIMP), is a free and open-source raster graphics editor [3] used for image manipulation (retouching) and image editing, free-form drawing, transcoding between different image file formats, and more specialized tasks. It is extensible by means of plugins ...
AV1 Image File Format Alliance for Open Media (AOMedia) AV1.avif image/avif General purpose royalty-free BAY: Casio RAW Casio.bay BMP: raw-data unencoded or encoded bitmap simple colour image format, far older than Microsoft; some .bmp encoding formats developed/owned by Microsoft.bmp, .dib, .rle,.2bp (2bpp) image/x-bmp Used by many 2D ...