[Peripherals] projector resolution

[Richard A. Smith]

Joshua N Pritikin wrote:
> Can anybody answer my question posted here?
> 
> http://wiki.laptop.org/go/Talk:Adding_USB_SVGA
> 
> I asked: "The projector ought to have what minimum resolution to display 
> a decent approximation of the XO screen? Does 800x600 result in a blurry 
> mess? Is 1024x768 enough?"

Depends on your scaling algorithm.  I've seen schemes that still look 
pretty good after a downsample to 800x600.  A lot depends on the text 
size and shape.  If you want to still have smaller size text thats 
readable after the scale then you need a really sophisticated scaling 
engine.

In pure grayscale the resolution of the XO is 1200x900 but in color mode 
its "something less than that"  How much less a lot on how define what 
the resolution means and what you are displaying.  The DCON retains the 
full luminance information meaning that if you draw a single pixel line 
in color mode you will see something its just a bit fuzzy.

However, all that magic is done in the DCON and maps onto our special 
display.  If you have a usb video device you will be working with the 
full 1200x900 RGB data and outputting to a display with a more 
traditional pixel layout.  So your end result would be more like what 
you would see when you scale the output from a traditional display device.

The short answer then is nobody knows. You will have runs some tests and 
see.

If I were going to test this then I think I would run a VNC server on 
the XO and then play with different settings on client and see how it looks.

-- 
Richard Smith  <richard at laptop.org>
One Laptop Per Child