[opendtv] Re: Vizio's very wide CinemaWide 21:9 TV is a revelation for movie buffs

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 2 Aug 2012 15:05:54 -0500

Craig Birkmaier wrote:

> Yes Bert, this is a valid explanation of one type of anamorphic
> squeeze that is possible, with the correction that John made. I
> described another way that Hollywood is getting around the CE
> industries obsession with 16:9.

Anamorphic squeeze means just one thing. Distorting in the transmission or 
storage, and then equal and opposite distorting in the decoding process, to 
restore the original. Similar things are done in 35mm cinemascope, in Dolby 
compression, in phono RIAA de-emphasis an pre-emphasis, in FM radio 
transmissions, etc.

What you described is not this. What you described is simply the painting to 
black bars to make the aspect ratio something other than 4:3 or 16:9.

In order to allow any and all display aspect ratios to be usable, and to 
provide maximum resolution with any source material, you would need to make 
each STB configurable to each of these different display shapes. Something that 
the CE companies do not do, and something that even HDMI does not accommodate.

This is why the ATSC and DVB have picked just two envelope standards.

>> Instead, what Hollywood "has been doing for years" is to put these
>> images into only one of two types of container: a 4:3 or a 16:9.
>> And any further adjustment in image aspect ratio is done by making
>> some of the vertical or horizontal pixels black.
>
> This is EXACTLY what I said.

And it **IS NOT** anamorphic squeeze! It's simply masking. The display doesn't 
have to undistort anything at all. Just either paint the black bars, or zoom in 
to eliminate black bars.

> Not true. You can use the full 1920 x 1080 and stretch it out on a
> 2.33 display, and you can squeeze the raster creating black bars for
> 16/9 displays.

Wrong. You cannot use the full raster this way, because there is no way for the 
STB to tell the display that it is doing this, so the display doesn't know how 
to undo it.

This is the crux of your misunderstanding, ever since the mid 1990s, as to why 
the ATSC (and DVB) had to pick envelope standards. That's getting to be close 
to 20 years!!

Bert

 
 
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