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2. 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]

3. 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.

4. Transparency (graphic) - Wikipedia

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

   This image shows the results of overlaying each of the above transparent PNG images on a background color of #6080A0. Note the gray fringes on the letters of the middle image. This shows how the above images would look when, for example, editing them. The grey and white check pattern would be converted into transparency.

5. White-ground technique - Wikipedia

   en.wikipedia.org/wiki/White-ground_technique

   White-ground technique is a style of white ancient Greek pottery and the painting in which figures appear on a white background. It developed in the region of Attica , dated to about 500 BC. It was especially associated with vases made for ritual and funerary use, if only because the painted surface was more fragile than in the other main ...

6. Thresholding (image processing) - Wikipedia

   en.wikipedia.org/wiki/Thresholding_(image...

   The simplest thresholding methods replace each pixel in an image with a black pixel if the image intensity , is less than a fixed value called the threshold , or a white pixel if the pixel intensity is greater than that threshold. In the example image on the right, this results in the dark tree becoming completely black, and the bright snow ...

7. Wallpaper (computing) - Wikipedia

   en.wikipedia.org/wiki/Wallpaper_(computing)

   A computer screen showing a background wallpaper photo of the Palace of Versailles A wallpaper from fractal. A wallpaper or background (also known as a desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, smartphone or other electronic device.