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Old December 15th, 2012, 02:57 PM   #1
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Moire when HD is broadcast in SD?

Hi Techies

Before the DSLRs came into my world I never notes moire, I probably just didn't care to look for it...
But lately I've seen moire in more or less every Program and film I watch on TV. In some shows more then other, but I would say that it is not from a DSLR... This is from all types of cameras! Fine fabric, dresses with dot patterns, walls, all this things that was "no no" whit DSLRs. But way do I se this in every show?
Is it a phenomenon that can happened when a HD program is compressed and down converted to SD?

Last edited by Markus Nord; December 16th, 2012 at 12:28 AM.
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Old December 15th, 2012, 03:24 PM   #2
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Re: Moire when HD is broadcast in SD?

That is pretty common if you do a straight down-convert without the proper softening of the HD image first.
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Old December 18th, 2012, 11:47 PM   #3
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Re: Moire when HD is broadcast in SD?

Quote:
Originally Posted by Markus Nord View Post
Hi Techies
This is from all types of cameras! Fine fabric, dresses with dot patterns, walls, all this things that was "no no" whit DSLRs. But way do I se this in every show?
Is it a phenomenon that can happened when a HD program is compressed and down converted to SD?
It's not the camera, it's the down conversion to your display. It could also be just the display, and not the signal. It happens when the display can't resolve data, something like a camera sensor in reverse!

It also happens to your eyes. Try looking at a test chart up close and you'll see.
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