4) What is an alpha channel?
An alpha channel is basically a mask that specifies how the pixel's of one image should be merged with another pixel from another image when the two are overlaid, one on top of the other, allowing transparency
(Source: www.merging.com)
How can this be useful in your coursework project?
Alpha channels can be helpful and useful in my coursework as it allows me to merge two or more images together to create a realistic image, e.g. placing a tram system from Germany into the Guildhall, by making certain parts of the tram system transparent and placing it in another image with the guildhall as the background.
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