If you’ve ever had to scale an image down for the web – or especially to make an icon – you might have noticed that the image actually gets a bit blurrier sometimes. This is surprising! We all know when you scale images up they get blurrier, but you would think when you scale down they’d get sharper, right? Well, no. Scaling down means taking a mathematical average between neighboring pixels and this will make fine details get softer as the colors of the background ‘bleed’ into them.
To help show this I’ve made up some example images.
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