04-05-2008, 08:11 PM
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#3 of 6 
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Joe
Member
Join Date: Apr 2008
Local Time: 05:48 PM
Local Date: 08-29-2008
Posts: 11
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Re: Circle hatches??
Makes sense Joe.
Let me quote from the ARIA manual:
Quote:
Circles: Perfect circles are a simple way to verify picture geometry, especially if you take a ruler or
tape measure to a Circle Hatch pattern and confirm that every circle’s height is precisely equal to its
width. This is often not the case, even with fixed-pixel displays like LCD and plasma that otherwise
pass alignment and geometry tests that are difficult for projection displays. That’s because many
widescreen displays are not precisely 16:9 in their pixel count, and to completely fill such a display
with a 16:9 image (like all the patterns in Avia II) the picture is slightly stretched, usually in the vertical
direction. The circles heights will then be very slightly greater than their widths.
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This left me unsure whether completely perfect circles were a necessity. It is clear to me though that measurement is something to attempt if you value accurate geometry.
I have an Hitachi 51G500 ... a CRT HDTV projection. Maybe I can refer to it by "CRT" from now on, if that tag helps more than others. (Note to self: write a sig line.. )
Joe
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