DVD Native Resolution Question

[hendra]

Why is DVD NTSC Native resolution 720x480 (1.5:1) while there is no movie or TV with such aspect ratio? I mean, Blu-ray native resolution is 1920x1080 (1.78:1) makes sense because that is the resolution of HDTV. But 1.5:1? Which TV or movie has such aspect ratio?

[jibucha]

Hello

Perhaps this is helpful?

704x480 l 16:9
640x480 l 4:3

Display Resolutions l So; the SD DVD aspect ratio of 704x480, and HD Blu-ray aspect ratio of 1920x1080, both fully fiil a 16:9 or 1:78:1 display entirely, therefore fully utilizing the display.

Meaning, that while one is an SD resolution, and the other an HD resolution; respectively, both are 1:78:1 display aspect ratios, making this a rather simple issue.

While this may seem simplistic, it is really this simple.

Aspect ratios of display resolution, and movie resolutions, can quickly become quite technical and confusing; but in the end, these two display resolutions, for SD and HD, are what were referred to in your questions.

Movie Resolutions l While there are many, usually a few are commonly used, 1:33:1 - 1:137:1 - 1:85:1 - 2:35:1, that are what we encounter on our respective DVD's and Blu-ray titles.

Video Resolutions l The 1:5:1 reference that you made, is an intermediate resolution dealing with the processing of the signal prior to actual display, as we actually see it; it is neither an display resolution or movie resolution. Technically, it is a video stream resolution.

Thank You

[alphadec]

see there is allot of questions about movie format so please have a look at this guide.

http://www.thedigitalbits.com/articl...reenorama.html

[dTm]

I can't find the exact details but I was reading about pixel mapping recently (wish I could still find the article) and with HDTV it's true 1:1 pixel mapping so the resolution is correct but in NTSC signals a pixel is slightly taller than it is wide and with PAL signal the pixels are slightly wider than they are tall

here is a link that might help: http://www.animationpost.co.uk/bitma...ect-ratios.htm - it is not the link I read previously which explained it better.

also to futher confuse:

http://library.creativecow.net/artic...pixel_madness/

http://lurkertech.com/lg/pixelaspect/

[4K2K]

Originally Posted by dTm

I can't find the exact details but I was reading about pixel mapping recently (wish I could still find the article) and with HDTV it's true 1:1 pixel mapping so the resolution is correct but in NTSC signals a pixel is slightly taller than it is wide and with PAL signal the pixels are slightly wider than they are tall

Doesn't it depend on the aspect ratio of the picture?

With 4:3 content using up 720x576 the PAL ones would be thinner than normal, seeing as, for 4:3 content with square pixels it would be 768x576. Maybe with 16:9 SD content they would be wider than tall.