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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