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I only recently learned this... 
VHS 250 lines of vertical resolution
DVD 480 lines of vertical resolution
Blu-ray 1080 lines of vertical resolution
VHS to DVD = 192% increase in resolution
DVD to Bluray = 225% increase in resolution
Discussion is locked
I should say 92% of 125% increase, respectively. Or 1.92x or 2.25x the resolution. Or am I confusing myself.
It is somewhat hard to compare analog and digital.
In analog picture quality in in the number of lines( detail) that could be seen in the horizontal scan lines.
Yes VHS was 240~250 horizontal lines of resolution. S-VHS was about 400 horizontal lines.
Standard DVDs are ED video of 720X480 pixels. This would be about 500~600 horizontal lines in analog video. Most broadcast analog cameras can do 700+ lines of analog video. When you see a 3x4 boxed picture on your HDTV you are looking at up scaled analog video.
When we change to digital the resolution is in pixels, it is much easier to compare 720x480 to 1280x720 to 1980x1080. To make it easier to say we just use the last number or 480, 720 and 1080. John
I was correct in vertical resolution only then. But, if I understand you correctly, the difference b/w DVD and BD is not as great as I was inferring, since analog has so few horizontal lines as you say.
thanks John
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