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If the pre-zoomed image was already downscaled (e.g. to fit a small display), then up to a point, zooming should simply downscale less, i.e. remove fewer pixels
by Twisol 5y ago
If the pre-zoomed image was already downscaled (e.g. to fit a small display), then up to a point, zooming should simply downscale less, i.e. remove fewer pixels. Beyond that point, yes, a zoom would have to perform some kind of interpolation.
In the CSI "zoom and enhance", anything beyond the simplest forms of interpolation would be part of "enhance", which is to say, not part of "zoom".
- ImprobableTruth 5y agoEven downscaling uses interpolation, but sure. The zoomed in part definitely wasn't shown at its native resolution though. And bilinear interpolation is as simple as you can get besides nearest neighbor, yet it still has the potential to introduce wrong information/cause artifacting. So even in the "CSI" sense, zooming can cause issues (unless you want to argue that only nearest neighbor is CSI 'zooming'? But then not even browsers do only CSI 'zooming').