Resizing for projection?

Is resizing (downwards from 4272 x 2848 pixels) desirable to give the best quality display when presenting images via an LCD projector?
If so, and the "native" resolution of a projector is not known, is there a standard reliable size in terms of maximum pixel width and/or height that will give a large good quality display in most instances?

Advice or comments, anyone?

Well, different projectors do have different resolutions. If you want a "one size fits all" image size my suggestion would be to research what projectors are in common use. Then, I'd probably suggest picking the highest standard resolution and sizing your image to fit that, do an appropriate amount of "output sharpening", and then figure that the lower-res projectors will "shrink" the image without too much loss whereas the higher-res projectors will keep the higher quality.

That's the approach I would also take for preparing "slides" to display on HD TVs -- size them for 1080 so that the higher res displays get full quality, but I wouldn't expect a 720 set to botch things up.

Pete328 wrote in post #12125949
Is resizing (downwards from 4272 x 2848 pixels) desirable to give the best quality display when presenting images via an LCD projector?

What make and model is the projector?

I would never make resolution higher than 1920x1080, as that is the usual highest resolution you will encounter (other than the megabuck projectors). There can be considerable loss of quality when a projector deviates from its 'native' resolution, even when it is rated to be able to display some higher resolution! And that is why I would not routinely size for any larger than 1920x1080.

Projection is where digital has greatly fallen behind the quality of slide film...we are able to project 2Mpixel images at best!

Thanks for your replies.

As per my original post, I do not have information on the specific projector to be used. Researching common resolutions, on the lower end are XGA projectors (1024x768) (4:3 ratio) and on the high end are rarer ones that get up into the 1080 pixel height range, and a 16:9 aspect ratio. Since I only will be displaying 16 photos, I used the Image Processor script in Photoshop (Bridge) to quickly produce two sets - one at max. 1024x768 resolution, and the other at max. 1920x1080. If the latter set won't display properly, I will switch to the lower resolution one.

There's lots of information about resizing images for printing, web display and e-mailing, but very little about optimizing for projection. Your thoughts and comments are appreciated.