If you see moire in studio, it is likely to appear in playback. The bigger problem is that you can get moire in playback that does not appear, or is not obnoxious in studio. Because of this, I try to be alert to even small hints of moire in online.
As for 1080p playback, it's not all the same. For instance, I always monitor at 1:1 pixel res (as should we all), but this is not the default mode for monitors coming from the factory. The default mode scales up to add the standard cutoff of the edge of frame. In other words, 1080p monitors are scaling by default. And that's best case. Many monitors will have additional zoom modes or filters enabled, or have the "sharpness" cranked. All of these things can aggravate moire on playback.
I don't want to make to much of this. It's not exactly mystical. But it does tend to confuse people in production when people later in the chain complain of moire and you don't see it.
Cheers,
tod
Tod Hopkins
Hillmann & Carr Inc.
2233 Wisconsin Ave., NW
Washington, DC 20007
202-342-0001
On Jul 16, 2014, at 7:31 AM, Dan McCabe danlist@bestmail.us [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
Interesting points. OTOH while one can't standardize all playback scenario isn't it likely that bad moiré on a 1080p monitor receiving a 1080p feed will likely appear on any 1080p monitor receiving that 1080p feed? Or is that more of a tossup?Part of the reason I ask is that the studio folks who were staring at a monitor didn't see anything. Either that's because it is entirely monitor dependent and completely variable or it is really getting generated in the Canon compression.Well said. It's not to be confused with aliasing, which happens in many digital cameras when there are diagonals in the image.
Jeff KreinesKinettaOn Jul 14, 2014, at 3:00 PM, 'Jeff Kreines @ Kinetta' jeff@kinetta.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:Different monitor resolutions will also affect moire. It can be the result of interaction between slightly diagonal lines in the image beating against the horizontal lines or rows.Moire is usually an active visual phenomenon in the playback chain, not a defect in the image per say. It arrises from the interaction of the patterns in the image with the grid patterns in the playback chain. In other words, you can't "correct" the moire in the image because it isn't in the image.You avoid moire by altering the original image so that it is less likely to trigger the phenomenon on playback. The easiest and most effective alteration is some type of blur. How much blur and what kind all depends on how much suppression you want and what type of pattern you are altering. You can also reduce moire be adding an obscuring pattern (grain) or sometimes by decreasing contrast if the moire is mild.It's hard to eliminate the possibility of moire because the playback chain is not standardized. You may see nothing in mastering, only to discover that when your image is scaled to another size in compression or playback, moire appears.Cheers,tod
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