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Old October 31st, 2003, 04:01 PM   #1
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Pixlet better than expected?

Ok, I've been doing some playing around and this is what I have found.

I have some footage of regular NTSC DV stock footage. If I layer some text on it - it's obvious that it has jagged edges. It looked aliased (as opposed to anti-aliased). I'll export to Pixlet and play it back - it looks really smooth. Unlike when I save to the standard Quicktime codec.

Does Pixlet add something or calculate in such a way that it helps all footage? I'd like to hear from other people who have looked at this too. I'm using high quality footage on a Mac, but of course its always looked NTSC-like. However, I swear that when I export to Pixlet and playback - it looks much better - smooth and without the edging. It's similar to when I use Photoshop to add very slight Gaussien blur (after applying the NTSC color filter). It makes the image playback better on NTSC - no jumping and flickering. (I recommend this to everyone by the way - always tweak stills before displaying on television - otherwise your images look like crap.)

Any thoughts anyone??

Chris
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Old October 31st, 2003, 05:26 PM   #2
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Re: Pixlet better than expected?

<<<-- Originally posted by Christopher C. Murphy : It's similar to when I use Photoshop to add very slight Gaussien blur (after applying the NTSC color filter). -->>>

Prior to compression very fine details are eliminated by a filter. You are seeing this filter in action.

Your experiment is telling us something about Pixlet.
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Old October 31st, 2003, 05:43 PM   #3
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Steve,

I just found out something not-so-good. Although, the overall image definately looks better when exporting NTSC footage with text - it also took the text that was suppose to come out of a white background and garbled it. However, it's interesting because the general look of the text is better. It was just this one short bit (about 1/2 sec.) that it looked garbled. The codec must have chocked on the little bit? In other words, it looks like it got confused when it encountered a fade-in. It garbled the text slightly before revealing it.

What does this mean? Obviously, we can't do this if we're sensitive of the minute details in text or whatever detail. However, I absolutely love the way it looks overall after exporting to Pixlet. There is no doubt that it does something to the footage. Is there a way to figure out exactly what it's doing?

Is there a white-paper available on Pixlet anywhere? I used to do tons of streaming video, so I know a bit about codecs etc. If Apple has some tech info anywhere at all - maybe we can figure out what Pixlet is all about. I know its not really a mystery, but I would like to know what is happening under the hood.

Chris
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Old October 31st, 2003, 06:24 PM   #4
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I've searched for details -- and nothing.

You don't want a codec to make any visible changes.
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Old November 3rd, 2003, 09:48 PM   #5
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I agree changes from the original footage should not happen but this codec is optimised for HD not HD witch does not use the same gamma I believe,and most certainly not the same resolution...

I have not yet tried Pixlet but as soon as my G5 arrives I will test drive Pixlet thoroughly for sure.
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