Visual artifact is usually some kind unwanted result/object in an image, often due to lossy compression. Examples could be pixelation, "blotches", texture corruption.

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Strange squares appear in halftoned PNG image with transparency

I have a strange issue with large, off-color "squares" appearing when I preview a PNG with halftones on a transparent background. This doesn't happen with all images (so far, I've only had the issue ...
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Which HSV-noise values do not cause artifacts on an LCD screen?

I have come to notice that certain HSV noise filter values applied to a uniform background colour look horrible when viewed on an LCD screen under certain viewing angles. This is more noticeable on ...
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Photoshop suddenly shows artifacts on my file

I am running Photoshop CC on Mac OSX 10.9.1. Today I opened one of my PSD files this morning and all of a sudden, these artifacts appear in some layers that have some effects on smart objects (but ...
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Photo with transparent coloured overlay has lots of artifacts when exported from PS

Ive got a high res photo that ive placed a transparent coloured overlay ontop of. In photoshop this looks fine, but when i export it either by File > Save As > Jpeg or File > Export for web ...