13-10-2016, 05:17 PM
When the TV systems were being designed there were assumptions made about screen size and viewing distance.
SD assumes viewing at around 6x or 7x picture height. 1080 HD assumes viewing at 3x to 4x picture height. Any further and you don't get the benefit, any closer and artefacts of the scan process are visible. Take an SD source, blow it up on to a big screen and watch from 3x picture height and it's not going to look too wonderful.
Of course the data compression adds another layer of artefacts, especially if it's pushed too hard. But remember the PAL artefacts - all the strobing colours on fine detail.
SD assumes viewing at around 6x or 7x picture height. 1080 HD assumes viewing at 3x to 4x picture height. Any further and you don't get the benefit, any closer and artefacts of the scan process are visible. Take an SD source, blow it up on to a big screen and watch from 3x picture height and it's not going to look too wonderful.
Of course the data compression adds another layer of artefacts, especially if it's pushed too hard. But remember the PAL artefacts - all the strobing colours on fine detail.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
