From: Paul 
Subject: Re: Why do their heads look too narrow, or wide
 
micky wrote:
 
> (And many other pictures they did correctly.)
 
But that potentially tells you something.
 
Some images contain metadata about scale (dots per inch).
 
For example, pulling a PNG off my C: drive...
 
Width:   800 pixels
Height:  608 pixels
Horizontal Resolution: 120dpi
Vertical Resolution:   120dpi
Bit Depth:              24
Frame Count:             1
 
Now, if you were to mess around with the DPI
and make it different on H versus V, that could
affect the results of using the image for something.
 
As for HD, 1920x1080 would be a definition. I don't really
know what media defined this. I couldn't find a better
article.
 
https://en.wikipedia.org/wiki/High-definition_television
 
1920 is certainly not high definition today, when we have
4K, 5K, and 8K panels.
 
    Paul
 

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