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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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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Border when downscaling bitmaps

Why does this border appear around the edges when I downscale a bitmap and how do I avoid it? It happens in Photoshop but also in a game that I'm developing where the framework resizes the sprite - ...