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Most graphics editing programs, such as Adobe Photoshop and GIMP, allow users to modify the basic blend modes, for example by applying different levels of opacity to the top "layer". The top "layer" is not necessarily a layer in the application; it may be applied with a painting or editing tool.
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.
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
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. Change the resolution to 800 ppi, and the same image now prints out at 2 × 1.5 inches.
Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer , it describes the absorption and scattering of radiation in a medium , such as a plasma , dielectric , shielding material , glass, etc.
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(Emulating "stepping back," which motivates downsampling in linear light (gamma=1), does not apply when upsampling.) A related method of reducing the visibility of ringing artifacts consists of using a sigmoidal light transfer function as pioneered by ImageMagick and GIMP's LoHalo filter and adapted to video upsampling by madVR, AviSynth and Mpv.
GTK (formerly GIMP ToolKit [2] and GTK+ [3]) is a free software cross-platform widget toolkit for creating graphical user interfaces (GUIs). [4] It is licensed under the terms of the GNU Lesser General Public License , allowing both free and proprietary software to use it.