1080i/p downconverting to 720p

Since I know very little about HDTV I'm rather hoping someone here will
answer my probably simple question.
I read somewhere that if a 1080i or p signal is downconverted to 720p,
some of the picture is lost/cropped.
Is this true?

Sorry for the probable silly question and thanks in advance.

fr.

When a 1080i signal is downconverted to 720p, there should be no
'cropping' taking place. There will be a loss of resolution. So the
picture should look the same as far as what you see, but will be lower
resolution, i.e., fuzzier.

wrote:
Since I know very little about HDTV I'm rather hoping someone here will
answer my probably simple question.
I read somewhere that if a 1080i or p signal is downconverted to 720p,
some of the picture is lost/cropped.
Is this true?

Sorry for the probable silly question and thanks in advance.

fr.

wbertram wrote:
When a 1080i signal is downconverted to 720p, there should be no
'cropping' taking place. There will be a loss of resolution. So the
picture should look the same as far as what you see, but will be lower
resolution, i.e., fuzzier.

Technically. Since it is being 'downconverted' to 720P, it is in a sense
straitening out the image and making it more beautiful. "Fuzziness" must be
your word for progessive.


wrote:
Since I know very little about HDTV I'm rather hoping someone here
will answer my probably simple question.
I read somewhere that if a 1080i or p signal is downconverted to
720p, some of the picture is lost/cropped.
Is this true?

Sorry for the probable silly question and thanks in advance.

fr.

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Guest wrote:
wbertram wrote:

When a 1080i signal is downconverted to 720p, there should be no
'cropping' taking place. There will be a loss of resolution. So the
picture should look the same as far as what you see, but will be lower
resolution, i.e., fuzzier.


Technically. Since it is being 'downconverted' to 720P, it is in a sense
straitening out the image and making it more beautiful. "Fuzziness" must be
your word for progessive.

Since it is a 1080i signal, it started out as an interlaced signal.
Downconverting it to 720p cannot magically introduce progressive
characteristics which were not in the original 1080i signal. If the
original signal was filmbased, it should be a fairly respectable 720p
signal. If the original signal originated from a TV camera, the
downconverted 720p signal will be inferior to a 720p originated TV signal.

"Fuzziness" is my word for reduced resolution.

wrote:

Since I know very little about HDTV I'm rather hoping someone here
will answer my probably simple question.
I read somewhere that if a 1080i or p signal is downconverted to
720p, some of the picture is lost/cropped.
Is this true?

Sorry for the probable silly question and thanks in advance.

fr.

wbertram wrote:
When a 1080i signal is downconverted to 720p, there should be no
'cropping' taking place. There will be a loss of resolution. So the
picture should look the same as far as what you see, but will be lower
resolution, i.e., fuzzier.

I've just dug out the piece. It's from an electrical store's
promotional brochure/catalogue for HD with an emphasis on 1080.

"....If the TV has a resolution of 720 x 1280 or 768 x 1366 (High
Definition resolution) it does nit have sufficient lines to display a
1080 HD picture. These TVs would 'down-scale' the picture to fit it to
the available screen resolution, removing some of the picture
data....."

The diagram below the paragraphs then shows how the 1080 picture would
be cropped to fit 768/720.

fr.