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Set up a video projector for better portrait mode photos Apps
Do you feel that this is a big disadvantage of modern picture projection compared to the old-fashioned slides: portrait format is really handicaped, because you have two big black bars on the left and right hand sides of the image. Video projectors have an aspect ratio of 4:3 (or even 16:9), compared to the quadratic display size of slide projectors. I thought about that and came up with the following solution:

If you could get a video projector with quadratic display size, everything would be fine. It would signal to the Mac a quadratic screen size (e.g. 768 x 768). If you would display pictures on that screen (e.g. with iPhoto), then portrait format would have the same size as landscape format pictures, each having black bars on top/bottom or left/right. But there is no such device.

So, lets cheat a little bit. With SwitchResX you can define a new custom resolution for the connected video projector. I defined 768 x 768 with 60 Hz to be somewhat on the conservative side at first. (You have to reboot to make this new resolution available.)

My video projector (an old NEC) accepted the new resolution without a problem, although the picture was not quite quadratic yet. I had to fiddle around a little bit with display width and zoom (I had to adjust "pace") but finally: voila, the display was quadratic. Now slide shows are much for fun, with a lot of portrait format pictures. Of course, you lose a bit of the native resolution of the video projector, since you do not use all the pixels of the rows, but that's OK by me.
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Set up a video projector for better portrait mode photos
Authored by: _merlin on May 28, '06 03:44:33AM

This won't do anything useful. Data projectors resample the video signal
to their native resolution. You'll lose quality by doing this.



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Set up a video projector for better portrait mode photos
Authored by: cwatts on May 29, '06 12:00:56PM
Not to be a duck, but you're misusing the term 'quadratic.'

'Quadratic' refers to 2nd degree equations (something like y=x^2+3x-3)

All you needed to say was 'square.'

http://dictionary.reference.com/search?q=quadratic
http://en.wikipedia.org/wiki/Quadratic

cw

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sttaw sirhc

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Set up a video projector for better portrait mode photos
Authored by: richard788 on May 30, '06 05:17:08AM

Anyone who has suceeded in connecting say a G4 Powerbook over DVI/HDMI to a
plasma screen without overscan and other effects? I've tried SwitchResX with no
success.



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Set up a video projector for better portrait mode photos
Authored by: tmccay on May 30, '06 11:32:05PM

I run a Powerbook G4 on a Digital Projection dVIsion HD all the time using DVI
and do not have the overscan issue.

However, I also use the same projector with a GrandTec DVI to Component
adapter hooke to a Core Duo Mini and that creates a more interesting situation:
The "window" provided by the converter underscans while the desktop
overscans within the underscanned window. Follow me? I have a blue line
across the top and video junk across the bottom with a desktop that is slightly
overscanned within that box.

Go back to DVI on the laptop and everything frames fine.

DP claims their multi-thousand dollar optical DVI cable will rememdy this issue.
I'll stick with the "under $500" converter for now.



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