Avoid blurred image after import?

Questions
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1

I use Import[] to import an image and ImageResize[] to resize it:

ImageResize[Import["figure.jpg"],{400,300}]

If I use that in a new notebook, I obtain what I want;

if I use it in the notebook that I am writing, the image is blurry and in low quality.

Why?

2

It’s hard to know what might be special about the notebook where this doesn’t work. What kind of notebook is it? Do you see the problem if you restart Mathematica?