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2. Transparency (graphic) - Wikipedia

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

   GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats.The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.

3. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   A popular way to create a composite image is to use transparent layers. The background image is used as the bottom layer, and the image with parts to be added are placed in a layer above that. The background image is used as the bottom layer, and the image with parts to be added are placed in a layer above that.

4. Hidden text - Wikipedia

   en.wikipedia.org/wiki/Hidden_text

   Hidden text is computer text that is displayed in such a way as to be invisible or unreadable. Hidden text is most commonly achieved by setting the font colour to the same colour as the background, rendering the text invisible unless the user highlights it. Hidden text can serve several purposes.

5. Pseudo-transparency - Wikipedia

   en.wikipedia.org/wiki/Pseudo-transparency

   This pseudo-transparency, so called as the background pixmap of the root window is visible (analogous to desktop wallpaper) rather than any obscured windows, allows users to make windows look less imposing (such as Terminal emulators, which usually comprise large chunks of text), and to integrate the appearance of windows with their desktop themes.

6. Alpha compositing - Wikipedia

   en.wikipedia.org/wiki/Alpha_compositing

   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] It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite .

7. Layers (digital image editing) - Wikipedia

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

   The top layer (the bird) is partially transparent, so the background clearly can be seen through its wing. In this picture the top layer has a drop shadow , a red color overlay of 40%, a gradient overlay from red to yellow of 20% opacity, and a slight bevel effect.