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I have had my HP XB31 projector for a year and absolutely love it. However I have run into a small problem.


I have a 16:9 screen and the HDTV image displayed by the projector used to fill the screen. Now something evil has happened and I am left with some room at the top and bottom of the image. In other words the height of the image has shrunk. Very annoying.


I have looked and looked and I cannot figure out how to stretch the height back out a little. Like I can do with monitors. There is no option in the menus for this. Am I missing something?


Thanks for any help anybody can provide.


-Cheema
 

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Quote:
Originally posted by cheema
I have a 16:9 screen and the HDTV image displayed by the projector used to fill the screen. Now something evil has happened and I am left with some room at the top and bottom of the image. In other words the height of the image has shrunk.
You have two sides of the equation to look at: 1) the source

device and 2) the destination projector.


The projector (xb31) itself has a 1024x768 DMD with

a 4:3 aspect ratio. The xb31 has an "aspect ratio" menu

that toggles between 4:3 (default) and 16:9. At 4:3,

the xb31 takes the incoming video signal and paints it

into the entire 1024x768 area. At 16:9, the xb31 takes

the incoming video signal and only paints it into the center

1024x576 area, and the projector introduces black bars

top and bottom to fill in the remainder of the DMD.


Source devices, like DVD players, have all sorts of options

that relate to aspect ratio, and I suspect your problem is

source-device related. Normally, you tell your source device

what aspect ratio the destination device is, and for the xb31,

it is 4:3 Then if the source device wants to play 4:3 content,

the source device fits the content as-is into the 4:3 video

output signal. If the source device wants to play 16:9 content,

then the source device squeezes the 16:9 content up-down

and introduces black bars top and bottom, and the whole

result is fed to the 4:3 video output signal. Some source

devices have a second option for handling 16:9 content sent

to a 4:3 device called zooming. The source device simply

takes the center 4:3 chunk of the 16:9 content, then scales

it up to form a full 1024x768 4:3 video output signal. While this

second option "fills the screen", you loose the left and right

portions of the content.


Having said all of the above, if you know you are always

playing 16:9 content on a 4:3 device, you are better off

setting the projector to 16:9 aspect ratio mode, and lying

to the source device and telling it that the destination device

is 16:9 too. The reason? It's better to have the source device

ship all the content as-is, and then let the projector fit it and

introduce *for sure solid black* bars. If you do it the other way

around, the source device has to generate the black bars, and

if sent via analog signals, they could become not-quite-black

bars by the time they are displayed.


--xb31
 
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