To start with, I took our lovely new testcard starring former 'Ziegfeld Folly' Dorothy Flood in the role of Carole Hersee. A reduction of the image in question is provided, right, but in reality it is 1440x1080 pixels (HD size). For this experiment it will be reduced to various resolutions of 576 in the vertical to mimic the resolutions of digital television. That's still quite a lot of picture for a little page like this so for ease of reference we're going to use crops. But clicking on a crop will bring up the full testcard for that resolution should you wish to enjoy the simulations in their full splendour (worth it in most cases for the frequency gratings alone).

The QAM-16 multiplexes broadcast their channels in a DVD-standard PAL resolution of 720x576. When the picture is glued together again, the pixels are stretched, and what results is given right.

I1 and C4 use a slightly lower 704x576 resolution. The centre-left crop is a mock-up of this. 

Most of the QAM-64 channels go with a paltry 544x576. This is not quite a halving of the screen-width in 16:9, and the results are centre-right. 

This 544 resolution is still theoretically better than an analogue PAL broadcast which is estimated as equivalent to about 440x576 (bottom-left). 

And then there's VHS, which is given to be about 330x576 (bottom-right). I have to say that this simulation looks a lot crummier than most of my video collection, but you get the idea.