Simply put, when you have two projectors lined up next to each other creating one solid image, you will never be able to create a seamless edge without edge blending projectors.
In both cases, a number of projectors are needed which are firstly overlapped and then visually joined together using an edge blending technique.
Typically, this is done to increase the size of a projected image to make a very wide image, or by combining a number of lower resolution devices together to increase the total resolution of a display. Edge blending is a technique used to describe the process of visually combining several projected images to make a single seamless image.
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