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Discussion Starter · #1 ·
Hello,


I've seen on some plasma screens (Hitachi, Sony, Philips) what appears to

be a "checkerboard" appearance to the screen when there is semi-fast

movement. Not large blocks but little tiny squares. Hard to describe. The

effect disappears when the image is relatively still. I think all pictures were

displayed at 1080i


The Panasonics do not seem to display this artifact.


Is this artifact a side effect of ALIS?


Best regards,


Paul Bigelow
 

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Without seeing it, it sounds like MPEG 2 artifacts. They are not uncommon with fast movement. However it seems like you indicate you don't see it with Pannys. Have you seen this with the same setups in a given store displaying the same material at the same time?
 

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Sounds like breakup in the source. It's quite common with fast motion and MPEG compression.


The worst I've ever seen it is with the old movie "the time machine". They have the sequence where he's going through time and the fast day/night switching causes the worst MPEG artifacts I've ever seen. It even happened with relatively high bitrates...
 

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Discussion Starter · #4 ·
Hello,


Thank you for the replies. I've seen this effect in different stores, different

material, but the sets showing the artifact are the same: Hitachi, Sony,

Philips. Panasonic, Toshiba, Mitsubishi do not show this artifact while

displaying the same material.
 
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