High Definition (HD) provides sharper, higher quality video and sound through higher pixel counts and improved compression formats like 1080p. HD can only be viewed on HD monitors or TVs. 3D works by feeding the eyes two slightly different images that combine to give the illusion of depth, though some people report headaches from prolonged 3D viewing. Pay Per View allows purchasing temporary access to movies, sports or other programming. On-Demand viewing provides access to catch-up TV and other shows through online services like BBC iPlayer for a limited period after initial broadcast.

1. High Definition HD
• High Definition televisions have more pixels in them for a
better quality picture
• A normal HD YouTube video will come in at 720p/i Or
1080p/i
• The P Means progressive which means each frame will
come one after the other. This leaves a much sharper video.
• Alternatively, I stands for interlaced meaning that each
frame overlaps the next. This gives you a less quality video
than the last but a smaller file.
• Not only the video, but the sound quality was made more
crisp with HD technology
• Unfortunately, you can only view HD content with a HD
monitor which can be fairly expensive.

2. 3D
• 3D originated from Derived from stereoscopic photography which is
technique for creating or enhancing the illusion of depth in an
image by means of stereopsis for binocular vision
• 3D works buy a image feeding you 2 slightly different images so
when they come together, it looks like the picture has definition.
• The older films would use a blue and red filter to give you the two
different images but it is more defined now with slicker glasses.
• You can now get it in TVs but instead of using glasses, when the
footage is filmed, it is put together to create your 3D image
• You can now also get it on Game consoles like the 3Ds.
• There are some isuees with 3D as people have found if you play on
a console with 3D or watch a TV in 3D for to long, you have start
getting headaches.

3. Pay per View
• Pay Per View is a system where you can purchase
a programme or a channel to watch for a certain
amount of time.
• With sky or PS3, you can purchase a movie to
watch over a couple days
• You can watch purchase any type of programme
on Pay Per, from Sports to X rated movies
• This kind of technology is one of the reasons
Blockbusters went bust

4. On-Demand Viewing
• This is where you can pick up your show when ever you
want as long as you have a internet connection
• It is found on sites like 4oD and BBC iPlayer where you
can select your program and watch it
• You can even get this service from your TV or console
• Any show is accessible through On Demand although
not movies as they don’t have the permission to
stream them online
• Usually there are limits to watching programmes On
Demand. The sites usually only keep shows that have
played on Live TV for one week. After that you wont be
able to get it On Demand until it next appears on TV.