Artifacts are wobbly line that are created by the pixles in the image, these are a result of image compression. The reason they form is because jpeg is a lossy format, this means as the image's compression ratio goes up the quality of the file/image is reduced. this can be avoided by using a lossless format. Another way to reduce the chance of artifacts on an image is to compress the file to a ratio where the file size is reduced but the image quality does not change. from my experience of using the image compression on firework, i have found that Approx. an 80% compression ratio does not reduce the quality of the image/file
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