At quality 80-85 the difference is invisible at normal viewing distance and the file typically drops by 60-80%. The catch is that it is one-way: re-saving the JPG repeatedly compounds the artefacts each time. Keep the HEIC as the master and regenerate the JPG from it whenever you need a new size. 高收入人口和健康信息中心以相同质量的相同JPG的大约一半大小,以10比特的颜色和真正的阿尔法频道储存一张照片。 JPG 丢失: 图像转换为 DCT, 量化和加密, 质量控制了丢弃多少 。
