Originally Posted by Darin
If you turn off geometry correction, it will render all 1920x1080 pixels. It's just that some of them will not be visible because they will be outside the screen area. That is simply the nature of rear projection. They can't make geometry perfect
, so they sacrifice some around the edges to keep the imperfection less visible. If you try to correct this electornically, you won't get full 1920x1080 resolution, because of the reduction required.
Correct, geometry is either enabled, using either factory or user settings to manipulate the shape of the image being projected, or it is disabled. Geometry correction is essentially just like using photoshop to "warp" an image in photoshop. And once that image is manipulated, it is slightly degraded, because not all the image pixels fall precisely where the physical pixels in the imager are. So interpolation must be used.
Anyone here successfully "disable" geometry correction on an 737 or 837? Darin has communicated to me he has successfully disabled it on the 73736.
I have not seen anything in the service menu alluding to the ability of disabling. Rather, the only options are for adjusting the correction or restoring the default correction settings.
I've adjusted for the geometry correction to the extreme such that one particular corner is set as being severely underscanned
. Test a 1080p signal that one can comparatively view lost pixel lines of details. I.E. image/frame data that would be visible on a 1:1 lcd.
My understanding of overscan is that a percentage of pixels are reflected towards the inside of the flat screen and are hidden from the viewer.
However, I am witnessing loss of pixels at the instance of reflection. For example, it seems as though the either the dlp chip's mirrors are not reflecting several lines, or these lines are obstructed somewhere in the lens or mirrors. Several lines of pixels are missing from the 1920x1080 composition and are not projected towards the flat screen. They've been eliminated prior to the light engine it seems.
I may be ignorant of certain technicalities and just wanted to see if others have noticed this. A small type copyright notice in a corner may be slightly cutoff even when adjusted for overscan.
Note: I upgraded from a 73927 to a 72837 and am very pleased. Do not take the aforementioned issue seriously as it is trivial. These dlp's offer tremendous performance while merely lacking 1:1 pixel mapping. The image on my presently non-calibrated 73837 can almost provide the wow factor as that of my 65813 calibrated by Craig. I look forward to seeing the 73837 calibrated.