Even so, how does that possibly translate into “330” lines of quantifiable detail?
To reach 480 would require that the details in your test target be precisely aligned with the scan lines. Suppose you have a camera pointing at 240 black/white pairs of horizontal lines set up so the displayed height of the test pattern on the monitor is the same as your 480 viewable scan lines. That target represents “480 lines” of resolution in video terms (photographers would call it 240 line pairs, or just 240 lines, but never mind that). Can you resolve those 480 lines, 240 white/black pairs, visually? Well, sort of. Maybe. Sometimes. What you really see will depend on where those details happen to fall in relation to the scan lines. If everything lines up perfectly, then sure, you’ll be able to count 240 pairs of black and white lines. Alternate scan lines on your monitor will be light and dark. But move the test target up or down by half the space between scan lines and all you’ll see is gray. That doesn’t count as 480 “lines of resolution”. Worse, space the test target’s lines
