Originally Posted by sub24ox7
Well any decent resizing algorithm will not cause aliasing like spline or lanczos or even bicubic and Alisiasing or jaggies is much differnt from shimmering imo.
Well, theoretically, as well as practically, as you’ll soon see….when you play the clip, downsampling can indeed cause aliasing and as skibum5000 says above, “if you get aliasing for moving frames then you sure can get shimmer, etc”.
I’m not making excuses for this suboptimal appearance, but rather, noting that unless one is very careful, it is possible even for experienced post houses [which have access to all FIR-type Filters (Sinc, Mitchell and Lanczos, etc.) as well as Cubic-type Filters (BSpline, Cubic, Gaussian, etc.) for which I feel certain Light Iron does (http://lightirondigital.com/
) ] for it to be possible for these type artifacts to occur.
Especially relevant to the notion of how easily this can happen, is that in this particular case, I think Red used this particular clip for a time as one of their showreels. If you look closely, I believe it is fairly easy to identify extensive aliasing artifacts (along with some slight shimmering or strobing, if you will) in the welder’s shirt which is secondary to downconverting the ‘4k’ material to HD….http://red.cachefly.net/M-X-REEL.mov
And that’s from a company that prides itself on Picture Quality so, I can’t see this clip as having been produced in a cavalier fashion.
Still haven't seen West Side Story though, as I'm more of a Mutiny on the Bounty fan.