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2. 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.

3. File:Merge (α,β).jpg - Wikipedia

   en.wikipedia.org/wiki/File:Merge(α,β).jpg

   Merge(α,β).jpg (180 × 140 pixels, file size: 3 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

4. Photomontage - Wikipedia

   en.wikipedia.org/wiki/Photomontage

   Photomontage is the process and the result of making a composite photograph by cutting, gluing, rearranging and overlapping two or more photographs into a new image. [1] Sometimes the resulting composite image is photographed so that the final image may appear as a seamless physical print.

5. Layers (digital image editing) - Wikipedia

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

   Layers can be partially obscured allowing portions of images within a layer to be hidden or shown in a translucent manner within another image. Layers can also be used to combine two or more images into a single digital image. For the purpose of editing, working with layers allows for applying changes to just one specific layer.

6. ImageMagick - Wikipedia

   en.wikipedia.org/wiki/ImageMagick

   Format conversion: convert an image from one format to another (e.g. PNG to JPEG). Transform: resize, rotate, crop, flip or trim an image. (Applies these without generation loss on JPEG files, where possible.) Transparency: render portions of an image invisible. Draw: add shapes or text to an image. Decorate: add a border or frame to an image.

7. Multi-exposure HDR capture - Wikipedia

   en.wikipedia.org/wiki/Multi-exposure_HDR_capture

   Tone mapped high-dynamic-range (HDR) image of St. Kentigern's Church in Blackpool, Lancashire, England. In photography and videography, multi-exposure HDR capture is a technique that creates high dynamic range (HDR) images (or extended dynamic range images) by taking and combining multiple exposures of the same subject matter at different exposures.