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Discussion Starter · #1 ·
Let's say that I have a 36" 4:3 monitor that is capable of a resolution of 1024x768 @ 60 hz. This monitor can't do automatic vertical squeeze like regular 4:3 HDTVs (Sony and Panasonic, at least).


I have a HTPC hooked up to the monitor and it sends a DVD picture via PowerDVD 4.0 that is 720x480 anamorphic.


Since the picture is effectively 720x480 anamorphic, how much picture quality am I losing when watching it on the 4:3 monitor without the anamorphic squeeze?


Am I going to get something like a 1024x600 DVD picture? How will the picture quality measure up to a true 720x480 with the vertical anamorphic squeeze? Thanks.
 

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Hi,


768 x 4:3 / 16:9 = 576 scanlines


You will have anamorphic 720x480 scaled upwards to 1024x576 in the middle of 1024x768 so you're still *upconverting* in both resolution axes even without the squeeze. So you're not dropping pixels.


Due to the nature of CRT monitors, and the poor dot pitch of most large-tube CRT's, image will generlaly still look sharper and better if you do 720x480 and squeeze it via the vertical image size adjustment to a 16:9 rectangle in the middle of your 4:3 display.


Another idea: Try 1024x768 with the anamorphic squeeze (ie, 1024x768 with the vertical image size adjustment reduced so that it's a 16:9 rectangle). That may add enough overkill of extra pixels to allow you to benefit from the enhancements of scaling.


If you cannot tell the difference, then your CRT tube doesn't resolve things razor-sharp at the microscopic levels of the scale of a DVD pixel, so you can choose whatever resolution suits you.
 

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Discussion Starter · #3 ·
Hey Mark,


Thanks for the information. The monitor I'm looking at buying is a Monivision DM7752S which as a 0.78mm dot pitch. I don't know if this monitor can do automatic vertical squeeze when it detects an anamorphic 720x480p signal. The 720x480p signal will be going through the VGA input from a HTPC. I have no idea if the VGA input can trigger automatic vertical squeeze or not.


That's why I was asking if my resolution will still be higher than 720x480p when there is no vertical squeeze when the 4:3 resolution is 1024x768.


I wonder how the vertical squeeze is automatically triggered in Sony and Panasonic 4:3 HDTVs when they detect anamorphic signals from the component video inputs.
 
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