cf723436__고화질_그림_지침___Wikimedia_Commons__분류
[공통적인 문제점들] Too high compression level Low JPEG quality settings in camera or when saving Visible JPEG artifacts [규정] Images should not use too strong compression. [토의] Use high quality settings in your camera and imaging software. For example, set JPEG quality "superfine" in camera, or shoot in a lossless image format such as RAW or NEF, or save with 95% quality in image editing programs. If editing a JPEG multiple times, perform all edits starting with the original, or use a lossless format (such as XCF). Repeatedly editing and saving a JPEG image will gradually lose quality. And do not save edited JPEGs with a significantly higher quality than the original—doing so increases an image's file size but not its quality. [분류] 
JPEG compression
Commons:고화질 그림 지침 - Wikimedia Commons