Video Resolution

[josh_the_hot_boy]

I need help in understanding something about video. I'm trying to understand video resolution. Like okay if I pop a dvd in my computer it well tell me the resolution is 720x480 but if I take a still it give a different resolution. Then there's anamorphic resolution and modulus and cropping idk I just would lije some over view. I was messing around with encoding a video from a dvd and was having trouble getting it to look right.

Any help or just knowledge would be great.

 

[gb2000ie]

The resolution of a video is the number of pixels in each direction for which there is data stored in the video file. A proper un-zoomed screen shot form a DVD should be at exactly DVD resolution, if not, then the video is zoomed when you took the snapshot, or your snapshot software zoomed what it captured before displaying it to you.

Since no one has a screen that is exactly 720x480px these days, movie playing software will scale the raw video data to fit the size of your screen, or the size of the window you're viewing it in.

As for the other terms you asked about, no idea.

B.

 

[hawtsean]

I need help in understanding something about video................. Then there's anamorphic resolution and modulus and cropping

Anamorphic is not a resolution, but a screen sizing and proportion - more properly termed the aspect ratio. The aspect ratio of an image is the ratio of the width of the image to its height, expressed as two numbers separated by a colon. CinemaScope was the original widescreen presentation, about 2:35 times wider than it was high (2.35:1). Modern anamorphic tv sets are 16:9 - the typical HD configuration. The resolution, as Bart nicely explained, is the number of pixels used to fill that space. More pixels, better resolution and sharper imagery.

Cropping is cutting or trimming the edges to make an image fit. Software can be used to make a video image created in one format, fit into another format - but cropping is destructive in that one loses the cropped out portions of the image.

Modulus in this context, indicates the algebraic formula used to derive the computer software characteristics (algorithm) that treat the image in a specific and desired way (format changes, cropping, etc.)

 

[josh_the_hot_boy]

What I meant was that if say I put the dvd into an encoding program like say Handbrake for mac it will say the source is 720x480 but like if I go into say vlc player and set it to original size and go up to video save snapshot the resolution of the image I took shows up as 640x480.

Maybe its just an error in my part but it confused me is all and the cropping thing I only use to say crop off the black bars that are embedded into the video.

Well thanks for the responses. I think I understand a little better now.

 

[gb2000ie]

What I meant was that if say I put the dvd into an encoding program like say Handbrake for mac it will say the source is 720x480 but like if I go into say vlc player and set it to original size and go up to video save snapshot the resolution of the image I took shows up as 640x480.

Maybe its just an error in my part but it confused me is all and the cropping thing I only use to say crop off the black bars that are embedded into the video.

Well thanks for the responses. I think I understand a little better now.

If you use the cropping thing then you would get less pixels out than you expected.

B.

 

[hawtsean]

Pixellated porn is pathetic, and prone to punitive pronouncements such as this one