Here's something I find baffling.
The differences between 1.jpg and 2.jpg is that the latter is stripped of EXIF data and the file size is obviously smaller.
Useful to know if you want to keep the EXIF data with the .jpg (or not). Is there a simple explanation for this?
let me reveal my ignorance, after an image is opened and edited what part of that data is relevant?
Thanks for that, Mek. I'm aware there are a number of ways to get rid of the EXIF data in a file, but that's not my irk. The irk is that when I Export for Web from a CPT that has not been closed and reopened, it still saves the file with the EXIF data intact, making Export for Web pointless (see sunnybrook's reply). Hence my agreement with Roy for a 'Save EXIF data" tick box (or similar) on Export/Save, or a proper full dialogue for editing/deleting EXIF data in Tools.
David Milisock said: let me reveal my ignorance, after an image is opened and edited what part of that data is relevant?
All of it!
It should be your choice as to what to keep/discard, surely? CPT shouldn't be a lossy format but I can understand why it is. Even so, it has niggles that could be resolved for some of us - and very simply too.