How Do I output a 1.78.1 resolution to my NEC XG from my HTPC?

Danny,


Your computer's video aspect ratio doesn't have to match the aspect ratio of your screen (1.78:1). Most of us run 'strange' resolutions that scale best and then simply stretch/shrink the image to fit the screen with the projector's internal controls.


An example: Since the NTSC DVD native resolution is 720x480, many with better projectors (like yours) will choose to run at exactly x2 the rez to get better scaling. In other words, 1440x960. The screen aspect ratio is irrelevent if all you care about is is DVD playback.


Other popular rez's are 1280x720 or 1440x720 since 960p is a bit high for most projectors other then good 8" EM machines (like yours) or 9" EM machines.


1280x720 is a real 1.78:1 ratio so it has one added advantage: If you want your computer desktop to also not look squished or stretched, then you have to make the two aspect ratio's match.


I run at 1080x720 (1.5:1 ratio) on my HTPC since my projector can't really resolve more then 720 lines and 1280 or 1440 across was also too much for it to resolve correctly so I backed down to 1080. My screen's 1.78:1


Kal

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Gary - I agree - 720p for a 16x9 screen is a pretty good starting point for an 8" EM-focussed XG. If you're running a 4x3 screen then you'll be using more raster height so 960p works out to about the the same number of lines/inch.


For the short time that I had an XG75 in the house, 720p ([email protected] to be specific) worked great on my 16x9 8' wide screen. Yes, if you set up your Sheimflug and astig/flare perfectly then you may see fine scan lines, but not from 8-12 feet back. This is probably why 800-820p is around the maximum that you'd probably need to go with an XG (assuming that Doug did the setup of course as someone else mentioned). 720p's most likely best for the rest of us.


I'm curious about the 70Hz recommendation as well... Mark is right that usually 71.928Hz is recommended in NTSC land to exactly triple the refresh rate of 24fps film shown in a normally 59.94Hz NTSC world (The math is: [59.94/60] x 24 x 3).


While I've never tried a Momitsu, I've heard that they do accept custom resolutions in the exact same format the PowerStrip puts out, so you can do a lot of custom rez/refresh rate stuff. Just get it set up right using a PC first then copy the settings over. (I don't have any direct links to this, but it's been discussed before in the forum so a search should find everything you're looking for).

Quote:
Yup! Been meaning to set one up myself for when I show digital photos (just been too lazy) since I want the AR to be correct... Good hint for the others here though... I forgot to mention it.


Kal