Picture save JPG, PNG, GIF format differences

Jpg/jpeg: Advantages: Smaller than PNG, open faster than PNG
Disadvantage: Belong to lossy compression, each save will generate data loss (JPEG artifacts), it is not suitable for multiple edits save. High compression rate image will distort
PS: The most common format on the network, but also static pictures (not just photos) on the use of the save format, even if the same team developed JP2 (equivalent to the 2nd generation of JPG) can not replace it.  In general, if the naked eye can not recognize the difference with PNG and no special requirements on the use of JPG. Small icons, with PNG storage best
PNG: Advantages: Lossless compression with transparent options, compression efficiency higher than BMP
Disadvantage: The general volume than the same size of the 90% compression rate of JPG is much larger (usually 5 times times more than), but the human eye is difficult to identify the difference between
PS: The most common lossless compression picture format, if it is often to edit a picture to save, require the picture data 100% complete, or need transparent effect (to PS when the material or as an icon, etc.) recommended use
JPG is suitable for photographic pictures, as well as colorful pictures. It uses the compression algorithm, will be on the image of each 8px*8px pixel processing, by forcing the gradient method to reduce file size, so no matter how high the storage quality of choice, or more or less distorted some, but for photography and other pictures, jpg format will be much smaller than PNG. GIF: Generally used only as a dynamic image format, is being replaced by Google's WEBM format