Quote - Why do members of this forum have to spout the equivalent of old wives tales over and over and over. Is it just impossible for any of you to try proving anything?

Sigh.

According to what I keep reading, if I open a JPEG and re-save it I lose something, right?

I screen grabbed Acadia's post. I then saved it as PNG and as JPEG (100%).

Then I opened the JPEG and saved it again - until I had gone through 15 JPEG compression steps.

I will now post the two grabs. You tell me which is the JPEG that was modified 15 times. No fair peaking at the file names until you do the comparison fairly with your own eyes.

I understand something is missing in the JPEG, but I defy you to see what. And whatever is missing is missing in all 15 copies, including the first.

JPEG removes stuff you don't need or notice. Once removed, no more is removed. Essential data remains.

It's like sweeping the floor. Just because you sweep it 15 times doesn't mean the floor got removed.

 

I maintain this is nonsense. See more:

http://en.wikipedia.org/wiki/JPEG