Question about JPGs and quality

[PeterAit]

JPGs can be saved at different levels of quality. Is 100% quality compressed without loss? I guess what I am asking is whether using PNG format, with its lossless compression, has any advantages over JPG at 100%.

[Schewe]

Only JPEG 2000 offers lossless compression. Normal JPEG, even at 100% quality does indeed loose some color data although it's very, very subtle.

[jrsforums]

JPGs can be saved at different levels of quality. Is 100% quality compressed without loss? I guess what I am asking is whether using PNG format, with its lossless compression, has any advantages over JPG at 100%.

Peter, you might find interest in this....
http://regex.info/blog/lightroom-goodies/jpeg-quality

[sniper]

You might also find it interesting to try outputting at different qualites. Someone in the studio exported some jpegs at very low quality 2 or 3 If I remember, I then exported some not realising the setting had been changes (yes I know I should have checked) It was only when I looked at the file sizes I realised. Even on a decent size screen it was hard to tell the difference.