Very much so. I-JPEG yi-codec efanayo ne-JPG phantsi koluhlu olude — i-DCT efana ne-pipeline, i-quantization table efana ne-quantization table, akukho nto malunga nee-pixels ezitshintsha ngegama lefayili. That determines both the headroom available and whether the saving costs you anything in fidelity.
Yes — i.jpeg ne.jpg izilungiso ziyi-bitstream efanayo, ngoko akukho nto apha esebenza ngokuhlukileyo kune-.jpg — kuphela igama lefayili litshintsha. It is worth knowing before you overwrite an original you might need again.
Ingaba i Cima JPEG iya kunyusa ubunjani be JPEG images yam?