![]() Counted lines must be intended to be straight curves will not work. Try it if you like! Just remember the few simple rules: You don't need any technical info or input from the dev-anyone can find the rendering res simply by counting steps and pixels. But the process only takes patience and a little math. In real life, scaling approximations, JPEG artifacts, and antialiasing all make discerning the stairsteps a lot more difficult. That correctly gives us 720p as the vertical rendering res. In our example, if the blue grid was from a 1080p screenshot, we'd multiply 1080 x (4/6). ![]() Therefore the display res multipled by this ratio equals the rendering res. Counting more steps can help overcome the approximations.) So now we have the ratio of render (steps) to display (pixels). ![]() This makes things blurrier and counting harder, but it won't eliminate the difference. In reality, a scaler in either the renderer or the display device will approximate, typically by filling with averaged colors. (The partial pixels are for illustrative clarity only. The line takes 4 steps, but in the blue display grid it crosses about 6 pixel rows-5 solid, and a half-row at top and bottom. ![]()
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