An undesirable element within a digital image, usually caused by low-quality compression, extreme low resolution, dust or dirt in a photograph original, or digital artifact caused by low-quality scanning or electronics failure.

The most common image artifact to avoid is caused by resaving JPG images; a pattern of squared develops and can be visible in the completed product.

Other artifacts are caused when a flatbed scanned become misaligned, causing colorful halos throughout an image, or when a digital file becomes corrupted causing areas in the image to disappear.