ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

SD and HD Video

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Jason Schoenfeld
SD and HD Video
on Jan 7, 2011 at 11:02:31 pm

I've searched the forums and have not found an answer to this question, and apologize in advance if one already exits. My question is in regards to SD (anamorphic) and HD video in After Effects...or any video editing/compositing software. If I take SD video and import it into a HD composition say 720p and scale it up to fit the comp - what happens to the SD video? Does it resample the pixel info and, if so, does it become 720? If it's 720 does that technically make it HD (as ridiculous as that sounds)? I know that scaling SD to fit HD is going to result in some fuzzy video, but I guess my question is: what makes HD...HD?

Or another example: playing a DVD in a blu-ray player. The player upscales the DV to fill my HD tv but, again, when is it considered HD (other than it just looks more awesome)?

Appreciate any help.


Return to posts index


Dave LaRonde
Re: SD and HD Video
on Jan 7, 2011 at 11:18:18 pm

[Jason Schoenfeld] "what makes HD...HD?"

The horizontal and vertical resolution of the picture. If you blow up SD video, you still have the same number of pixels in the picture. They're just bigger. You get no additional resolution.

You can watch a DVD on a hand-held DVD player. You can also project that same DVD on the side of a building. The resolution of the DVD doesn't change; it's still 720x480.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


Return to posts index

Jason Schoenfeld
Re: SD and HD Video
on Jan 7, 2011 at 11:22:21 pm

Thanks Dave - that answered my question. I wasn't sure if the pixels became larger or if it created pixels based on existing information. Thanks again for the help.

Jason


Return to posts index


Jason Schoenfeld
Re: SD and HD Video
on Jan 8, 2011 at 4:41:54 am

Dave,

I'm still having a somewhat difficult time understanding this. Projecting video onto a wall and having the pixel dimensions increase in size make senses, but I'm still having a hard time understanding what happens to the pixels on a computer screen when SD is upscaled. As a test I took a SD video, imported it into a 720 x 1080 comp in After Effects and scaled it up to fit the comp. Yes, it didn't look too good but when I exported one of the frames and took it into Photoshop I counted out 720 x 1080 pixels (didn't seem as though the pixel size increased).

Thanks again for the help.

Jason


Return to posts index


Andrew Devis
Re: SD and HD Video
on Jan 8, 2011 at 10:29:54 am

A rule of thumb for HD is this: anything that is larger than SD is HD. So, when you exported out the frame you were exporting out an HD comp regardless of the size of the image you used in it - so it would be HD.

Hope this makes sense.
Andrew

... because it's all about stories ...


Return to posts index

Jason Schoenfeld
Re: SD and HD Video
on Jan 9, 2011 at 1:46:13 am

Yes, that makes sense. Thank you all for the clarification.

Jason


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]