There has been a discussion about this earlier where we haven’t reached a complete understanding if any underscan is going on. Best way to determine how much of the black pixels you see that are real and how many that belongs to the inactive pond of micromirrors is to compare to the size of the splash screen. That screen uses all of the active pixels, so if your image without keystone correction is smaller than that then there’s some odd underscan going on. Link here: Projection isn’t projecting full size
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