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  2. 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 ...

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

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

    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 See also: Bumping (GIMP 2.2), based on ...

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

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

    If the new version is too sharp, you can utilize the blur filter or tool to fix this, or use Colors > Levels to mess with the Alpha channel. Once it looks correct, save the image as a PNG. Then, to reduce file size, run it through a program like ImageMagick that supports 8-bit PNGs with alpha transparency, in order to remove any unnecessary ...

  5. Image editing - Wikipedia

    en.wikipedia.org/wiki/Image_editing

    The Image Size dialog can be used as an image calculator of sorts. For example, a 1600 × 1200 image with a resolution of 200 ppi will produce a printed image of 8 × 6 inches. The same image with 400 ppi will produce a printed image of 4 × 3 inches.

  6. Wikipedia:Graphics tutorials - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Graphics_tutorials

    Vector graphics, Raster graphics, 3D graphics, Word processors, Graphics, Computer graphics, Page layout, Image editing; Images for cleanup: images that need improvements; Image use policy: general information on using images on Wikipedia; Public domain image resources: sources for public domain images, organized topically

  7. Seam carving - Wikipedia

    en.wikipedia.org/wiki/Seam_carving

    Original image to be made narrower Scaling is undesirable because the castle is distorted. Cropping is undesirable because part of the castle is removed. Seam carving. Seam carving (or liquid rescaling) is an algorithm for content-aware image resizing, developed by Shai Avidan, of Mitsubishi Electric Research Laboratories (MERL), and Ariel Shamir, of the Interdisciplinary Center and MERL.

  8. GIMP - Wikipedia

    en.wikipedia.org/wiki/GIMP

    GIMP's native format XCF is designed to store all information GIMP can contain about an image; XCF is named after the eXperimental Computing Facility where GIMP was authored. Import and export capability can be extended to additional file formats by means of plug-ins. XCF file size is extended to more than 4 GB since 2.9.6 and new stable tree 2 ...

  9. G'MIC - Wikipedia

    en.wikipedia.org/wiki/G'MIC

    G'MIC (GREYC's Magic for Image Computing) is a free and open-source framework for image processing. It defines a script language that allows the creation of complex macros. Originally usable only through a command line interface, it is currently mostly popular as a GIMP plugin, [2] and is also included in Krita.