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Hi, when I uploaded this image on a social media site it had this blurry mirage-like pixels around the shrimps. I am not sure what is causing this, because when I viewed the image in my pc it looks crisp and not like this. What seems to be the problem? Is it the way I saved it from photoshop? Or the website just decompresses images so It doesn't look like how I want it?

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    These are jpeg compression artefacts. The problem is probably the social media site, and how they are processing uploaded images. See if the site has a help page. – Billy Kerr Feb 12 '18 at 14:48
  • Along with the current answer I'd also like to add that increasing the image resolution before uploading might help. It seems like this image is really really small – LateralTerminal Feb 12 '18 at 15:37
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There's plenty of JPG compression artefacts. Who has made them? Maybe you, if you have saved as JPG and used high compression (=low quality level). The website can increase it when it tries to make files smaller.

High contrast edges are especially sensitive to get those artefacts. A little blurring reduces them.

The website can have some recommendations how to retain the quality. See them.

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