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BluRay on 720p?

post #1 of 12
Thread Starter 
I'm planning on buying a 32inch 720P LCD and a PS3 in the coming week.
I know if I were to get a 1080P LCD any signal I play on it that is 720p (Game consoles for example) will look like crap because anything that isn't on the native resolution on LCD's just doesnt look good.

So my question is if I was watching a Bluray movie which I think is 1080p on a 720p TV, how will it look?

Edit:: Also feel free to correct me on my above statements if they're false. I'm just trying to understand this correctly.
Edited by Truambitionz - 5/13/08 at 4:16pm
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post #2 of 12
Having done exactly what you're asking, I hope I can offer some insight. I have a 32" 720p set, and a 56" 1080p set. The PS3 can output both 720p and 1080p. TV's however will only accept 1080p over HDMI, so keep that in mind. I know most HDTV's come with them, but if you're getting a closeout or something, there is a chance that it won't.

I however use an older Xbox360, and when playing, or even in the menus, I can't tell that it's playing at 720p over Component. I think that you'll find that it's a high enough resolution, that unless you are sitting right up next to it, especially on a 40" and smaller, 720p is absolutely indistinguishable from 1080p.

If you have any further questions, feel free to ask.
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post #3 of 12
Thread Starter 
Theres some insight, thanks.
I do have an Xbox360 but I want to be able to rent and buy Bluray movies, so I'm getting a PS3 too. I just wonder how well the downscaling on a PS3 is from 1080 to 720.
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post #4 of 12
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post #5 of 12
I have a 32" samsung 720p lcd and a ps3 and 360. the ps3 looks great for gaming, since most games are 720P native. Blu-rays look WAY better than dvd's. So you can tell a difference and I think it looks great. It will look way better on a 1080p but you cant tell a difference on any set 40" and under unless you are right in front of the screen. I work at Best Buy and did tons of research and checked out all our tv's before I bought mine(its for my bedroom and im 16 yrs old) and the 1080p 37" and 40" did not look any better than their 720p counterparts. so i will say it will look great still.
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post #6 of 12
TL;DR - 1080p downsized to 720p looks better than native 720p

Quote:
Originally Posted by I made you a book but I eated it
It won't get any uglier by just downsizing... in fact, since you're downsizing, you'll gain sharpness and artifacts will disappear.

The problem is with upsizing, and when you start with high quality (bitrate) video and a high resolution, it doesn't matter that much.

This is because when you upsize, the small artifacts that come with video compression grow in size and get really ugly and exceptionally noticeable.

Think of a balloon with a black logo on it. When the balloon isn't inflated, the nylon or latex or whatever is more concentrated and the logo appears darker, sharper and more defined.
Once you inflate or stretch the balloon, though, the nylon gets stretched out and loses thickness.
As a result it, most of the time, becomes partially transparent and loses it's sharpness and high definition (XD).

It's the exact same amount of material, but it's stretched over a larger area.

Now, if you were to shrink the balloon even more, the material will pile up together even more (like how you can condense/flatten a metal), and the logo will get darker.


All this yadayada was to give you a metaphor for pixels.

Images (or video frames in this case) are resized by averaging (or whatever formula some random person came up with) neighbor pixels to create new, similar pixels with features from the "parent" pixels (the pixels have schmex!)

When downsizing, the process is the opposite. Neighbor pixels have schmex and create new pixels, except this time the new pixels are "original" pixels which were squeezed into one pixel.
This is akin to shrinking the balloon. The pixels become "thicker" (in balloon terms) and gain sharpness and are better defined.


Let me demonstrate with two screens - this isn't 1080p, so I resized from 720p to a SD resolution.
720p
720p -> 768x432

The hairdryer is much sharper

Edited by Coma - 5/14/08 at 8:58am
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post #7 of 12
slightly irrelevent, but im getting a samsung 22" 225MW monitor, its contrast ratio is 700:1 (can be compared to 1500:1 on other brands) and on, i think 1920x 1152 i think it works out at 1080p, me and my freind worked it out, but i cant remember the exact res it was
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post #8 of 12
Quote:
Originally Posted by Coma View Post
TL;DR - 1080p downsized to 720p looks better than native 720p
Great Comparison, I was wondering about this too

+REP
post #9 of 12
Quote:
Originally Posted by Coma View Post
TL;DR - 1080p downsized to 720p looks better than native 720p
That balloon analogy is flawed though.... Pixel are discrete values. When downscaling, the formula must use some interpolation and rounding. While upscaling is definitely not great, downscaling should be the same or worse than native. Is there any special processing done with the downscaler?
Edited by DuckieHo - 5/14/08 at 9:14am
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post #10 of 12
Like I (think I) said, the purpose of that post wasn't to explain how resizers work (as there are many types and some are completely different from others), but to give a single example and compare it to something that happens in real life.

It didn't have to be perfect or 100% true, all that matters is at the end of the day, an empty balloon looks more "defined" than an inflated one, despite the fact the balloon was "mastered" for "high definition" (being stretched).

So basically, despite the fact it was made for 1080p, it'll (usually) look better after downsizing (*) to a lower resolution.
This is just another fact of life You gain sharpness when downsizing and lose sharpness when upsizing.

Also, no, there is no postprocessing.

* not downscaling... "scaling" is added when you do things like sharpening, denoising, etc to an upsized clip to mitigate the stretched look and the noise and blocks that became huge and ugly
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