Keystone correction is a feature that helps fix image distortion when a projector isn’t perfectly aligned with the screen. Normally, if you place a projector too high, too low, or at an angle, the projected image can appear as a trapezoid instead of a rectangle. Keystone correction digitally adjusts the image to make it rectangular again, even if the projector isn’t centered.
There are two types: vertical keystone correction (fixing height-related distortion) and horizontal keystone correction (fixing side-angle distortion). Some modern projectors even include automatic keystone correction, where the device detects its angle and adjusts automatically.
While keystone correction is convenient, it’s worth noting that it is a digital adjustment, meaning it slightly reduces image resolution compared to physically aligning the projector correctly. For best image quality, it’s always better to position the projector directly in front of the screen. However, when perfect placement isn’t possible—like in small rooms or temporary setups—keystone correction is a very helpful tool.
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