1:1 pixel mapping means that the input signal matches the native resolution to your projector.
For example, the HS-10 has a native resolution of 1366x768. So, if your input source is anything but 1366x768, the projector will scale it to 1366x768. If your projector doesn't have a good quality scaler, then the image could have some artifacts (like stair stepping in horizontal lines). However, if you send the projector it's native resolution, then no scaling is necessary.
Generally, 3:2 doesn't refer to resolutions, rather the conversion of film's 24 frames per second to video's 30fps.
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