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  2. Help : How to reduce colors for saving a JPEG as PNG

    en.wikipedia.org/wiki/Help:How_to_reduce_colors...

    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.

  3. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    The Photoshop and illusions.hu flavors also produce the same result when the top layer is pure white (the differences between these two are in how one interpolates between these 3 results). These three results coincide with gamma correction of the bottom layer with γ=2 (for top black), unchanged bottom layer (or, what is the same, γ=1; for ...

  4. Wikipedia : Manual of Style/Chemistry/Structure drawing

    en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/...

    Therefore, save as a 1200 dpi greyscale TIFF image and decrease the color depth to 2 bit (black and white) during image processing. Image processing (Photoshop or Irfan view): Add canvas of about 5% to each side (test it, usually around 30 pixels) (Photoshop: Image:Canvas Size, relative, 10% width, 10% height) Save as a PNG black/white bitmap ...

  5. Wikipedia:Basic bitmap image editing - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Basic_bitmap...

    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. GIMPshop is a version reworked to act more like Photoshop. Seashore is a GIMP-derived editor for MacOS.

  6. Wikipedia : Graphics Lab/Resources/QGIS/Shaded reliefs

    en.wikipedia.org/wiki/Wikipedia:Graphics_Lab/...

    GIMP > open shaded relief NAME.ext > GIMP > Image > Scale image > Check pixel size, Resize to 20% of its size > Save as NAME-20%.ext; GIMP > open NAME-20%.ext > Image > Scale image > Resize to former pixel size (exact pixel size) QGis or Inkscape > open both layers > Opacity 50% to each; Also to try out: GIMP > Filters > Map > Map bumping

  7. Layers (digital image editing) - Wikipedia

    en.wikipedia.org/wiki/Layers_(digital_image_editing)

    Layers were first commercially available in Fauve Matisse (later Macromedia xRes), [1] [better source needed] and then available in Adobe Photoshop 3.0, in 1994, but today a wide range of other programs, such as Photo-Paint, Paint Shop Pro, GIMP, Paint.NET, StylePix, and even batch processing tools also include this feature.

  8. Color balance - Wikipedia

    en.wikipedia.org/wiki/Color_balance

    where , , and are the color balanced red, green, and blue components of a pixel in the image; ′, ′, and ′ are the red, green, and blue components of the image before color balancing, and ′, ′, and ′ are the red, green, and blue components of a pixel which is believed to be a white surface in the image before color balancing.

  9. GIMP - Wikipedia

    en.wikipedia.org/wiki/GIMP

    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, and ...

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