Still don't know the difference between standard def. and high def?

[Razorguns]

Currently (to my understanding) different shows/channels broadcast in either 720p or 1080i based on what they feel is the most clear(or profitable).

It's because the originating source only shot in 720 or 1080. Not every production company is HD capable. Many only have infrastrucute to handle 720p or still are clueless about 1080 interlacing. Or even 1080 in general (eg: Group of Frame compression, 1.33 pixel aspect ratio, etc.).

Generally, if it's not news or live sports, shoot progressive. The broadcaster converts it and sends it out interlaced. A lot of older HD footage is only 720p.

r

 

[Creepusmaximus]

It's like when surround sound came out for the masses. A lot of older movies said surround sound but it was never recorded for that purpose and they just went back and remixed the audio for a DVD. Did it sound better than what was on a VHS tape? Yes is did but it wasn't like the difference of going from VHS to DVD's. It also wasn't like movies that recorded their audio with surround in mind.