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

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

    Concept: make the shaded relief whiter, or better transparent, so only the shadows appear. Make lighter background ("Avoid chartjunk/overload"). Specifics: Work on RGB files only. When opening the .tif file in GIMP, the landmass appear grey, northwest sides of hills appear white, while hills' south east side (shadow) appear black.

  3. 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 ...

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

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

    Use the color to alpha tool with the background color to remove the fringe. Now cancel the selection, go to the Channels panel and deselect the Alpha channel, then go back to the layers panel. Use the fill tool to fill the selection with the main color. (Since you turned off alpha, this will not affect the transparent section.)

  5. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    The result of applying several of these modes depends linearly on the pixel level of the top layer. In such cases, when the top layer is purely black, one gets a certain transformation of the bottom layer (which may be just a purely black or purely white image). When the top layer is purely white, one gets another such transformation.

  6. Alpha compositing - Wikipedia

    en.wikipedia.org/wiki/Alpha_compositing

    A color spectrum image with an alpha channel that falls off to zero at its base, where it is blended with the background color. In computer graphics , alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency . [ 1 ]

  7. XCF (file format) - Wikipedia

    en.wikipedia.org/wiki/XCF_(file_format)

    XCF, short for eXperimental Computing Facility, [1] is the native image format of the GIMP image-editing program. It saves all of the data the program handles related to the image, including, among others, each layer, the current selection, channels, transparency, paths and guides.

  8. Transparency (graphic) - Wikipedia

    en.wikipedia.org/wiki/Transparency_(graphic)

    The edges of characters and other images with transparent background should not have shades of gray: these are normally used for intermediate colors between the color of the letter/image and that of the background, typically shades of gray being intermediate between a black letter and a white background. However, with, for example, a red ...

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