question about non-square pixels/HDCAM
Posted 02 February 2009 - 03:01 PM
I read this over on wikipedia:
"The HDCAM codec uses non-square pixels and as such the recorded 1440×1080 content is upsampled to 1920×1080 on playback."
Now I understand what non-square pixels are, and I know the more horizontal resolution removed during compression, the more rectangular the pixels become..
But my question is, how are non-sqaure pixels used in an NLE, and shows on crt televisions/LCD/Plasmas?
How are they upsampled? Do TVs just cut them in half so they're square again?
Posted 02 February 2009 - 04:01 PM
Posted 04 February 2009 - 02:49 PM
How do non square pixels become square? Do they just add lines empty line or something?
When editing DVCPRO HD footage on Premiere CS4 I'm editing with 960x720 files in real time. They aren't upsampled, at least to my knowledge. The pixel aspect ratio is 1.33
Posted 04 February 2009 - 03:06 PM
It just blows the image up, exactly as you would in Photoshop (actually, probably not as well as you would in Photoshop).
> When editing DVCPRO HD footage on Premiere CS4 I'm editing with 960x720 files in real time. They aren't upsampled, at
> least to my knowledge. The pixel aspect ratio is 1.33
Yes, the pixel aspect ratio is Premiere's flag to stretch the image out to 16:9.
Posted 04 February 2009 - 03:35 PM
What does blowing up the image mean? How does 960 become 1280. I always thought the pixels were just extra wide, because 960x1.33 = 1280
but that's probably not correct is it?
And does premiere ADD redundant pixels so I'm editing a 1280x720 image or are they rectangular non square pixels I'm seeing