Artifacts in various types of graphics refer to almost any anomoly in the picture displayed on the screen. Most often, it's simply a spot or wiggle on the screen, or pixels show up in wierd colors, or sometimes, the game shows strange effects on the screen. Artifacts can be the result of a number of different issues, including monitor display maximums, a graphics card heat or software problem, too much hardware exceleration, or a number of other things.
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I have run across a term that I do not understand, artifacts. I could guess but I would like to know what the term really means in reference to graphics. Is this term refering to old images intergrating themselves with new ones like ghosting or something?