Example. I've read somewhere it's because people upload them in too high resolution and the browsers' scaling programs aren't perfect. However, today I bumped into a distorted logo of equal size on this website.
So what can one do to avoid it?
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I'm not sure what image you are referencing so to answer your question more accurately I'll list the main reasons why images get distorted in general.
Most common variable (for taking photos of raster images):
Distortions upon high-quality raster images:
Distortions upon vector graphics:
<image width="778" height="300" transform="matrix(1,0,0,1,0,0)" preserveAspectRatio="none" xlink:href="data:image/png;base64,">) and displayed that way. In which other variables such as sizing of the raster graphic I mentioned above would cause the distortion.
I hope I answered your question.