Originally Posted by
manker
Yeah. I didn't really understand a lot of the jargon there. Except to say that a frame is technically a border
Lens shift and keystone correction are ways to alter the image so that the proportions look correct, even though the projector isn't exactly centered, like.
Illustrated, here.
Lens shift is mechanical, which is to say that the lens is physically adjusted to make it look right.
(Digital) Keystone does something similar, but instead of changing the angle and focus of the lens, it uses software to change the image which is to be projected. Lens shift is always better since it just sets the lens and then works passively rather than having to devote processing power to converting the image. Keystone may also distort the edges of the image noticeably depending on how good it is implemented, and how extreme the angles are. With both in combination you do get a lot of leeway on how to place the projector, though.
In my case I watch a lot of stuff through my computer as well, still through hdmi, and could in theory have the graphics card do the keystoning. Haven't tried it, however.
Lumen is a measurement of light. More lumens are brighter.
edit: Technically, I think you can also call what I call lens shift Optical keystone correction, and what I call Keystone Digital keystone correction. Idrk what's more correct.
http://htrgroup.com/main.php?section=keystone
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