Many rooms in office buildings and even hotel conference rooms have low ceilings. Sometimes just 2.4m.
The rules stipulate that the floor to projected image base height should be at least 1.2m to allow for good viewing, based on the average seated height of a person, in multi-row set-ups.
Further more that the maximum viewing distance should be 5x the projected image height for high definition data projection.
Now if you use a projector, ceiling mounted, which offsets the image, meaning the top of the projected image is well below the projector lens level.
That means, you may need to tilt the projector up, to start your image as high up the wall as possible. You then need to correct the image distortion with the anti-keystone correction, if the projector does not have sufficient vertical shift.
If you use a traditional UST projector, the image distortion may exceed the projectors adjustment capabilities.
Of course you can try to correct the image using devices like Geobox or software, like Vioso 6, to overcome this, provided the optical system of the projector gives you enough depth of field for consistent sharpness.
Alternatively you can use a Fujifilm Z-Series projector.
No offset projection. Plus enough image shift, that you can move the image up, distortion free, to to absolute top of the wall.
This will maximise your available image size and improve viewing for your audience. In particular in the back rows.
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