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2. Transparency (graphic) - Wikipedia

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

   Some image formats, such as PNG and TIFF, also allow partial transparency through an alpha channel, which solves the edge limitation problem. Instead of each pixel either being transparent or not transparent, it can be set to 254 levels of partially transparent, allowing some of the background image to show through the foreground image.

3. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   The background image is used as the bottom layer, and the image with parts to be added are placed in a layer above that. Using an image layer mask , all but the parts to be merged is hidden from the layer, giving the impression that these parts have been added to the background layer.

4. 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.

5. Adobe Photoshop - Wikipedia

   en.wikipedia.org/wiki/Adobe_Photoshop

   Adobe Photoshop is a raster graphics editor developed and published by Adobe for Windows and macOS.It was created in 1987 by Thomas and John Knoll.It is the most used tool for professional digital art, especially in raster graphics editing, and its name has become genericised as a verb (e.g. "to photoshop an image", "photoshopping", and "photoshop contest") [7] although Adobe disapproves of ...

6. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   Metadata – An image may have metadata stored in EXIF or XMP formats. Transparency – An image may have transparency, i.e., an alpha channel. Color Profile – An image may have an embedded ICC profile as described by the International Color Consortium. Animation – An image may have multiple frames with pauses between them, making it an ...

7. Video matting - Wikipedia

   en.wikipedia.org/wiki/Video_matting

   Left to right: input image, background, foreground, and alpha matte. The basic matting problem is defined as following: given an image I {\displaystyle I} , compute the foreground F {\displaystyle F} , background B {\displaystyle B} and alpha matte A {\displaystyle A} , such that the equation I = A F + ( 1 − A ) B {\displaystyle I=AF+(1-A)B ...