Image interlacing is a technique for displaying a rough version of an image early, then progressively refining it. Instead of rendering pixels linearly, data is produced out-of-order so a low-resolution preview appears quickly. Several interlacing methods are compared: 'Blinds' (equal-sized passes), 'Y halving' (useful image at 6-12% data loaded), 'XY halving' (useful image at 2-6% data loaded), GIF-style interlacing, and PNG's Adam7 scheme. Adam7 is highlighted as a balanced compromise — it provides a quick initial image while also offering multiple intermediate passes for go/no-go decisions before the final render completes. An interactive demo lets readers step through each method pass by pass.
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