Different Scale factor when doing SAVE AS and SAVE FOR WEB - on Windows?

Well, same explanation, actually. Place in InDesign does the same thing - it honors the physical size as defined by the ppi number.

Export strips the ppi number from the file altogether. When reopened into another application, PS or ID, a default value of 72 is assigned.

So if the original ppi number is not 72, they will come in at different sizes on the page.

@D Fosse 

For some reason - I can't quote your reply...

Have you checked the thread? Or at least the link intself?

It's about InDesign placing JPEG files incorrectly.

And it looks like only PS & InDesign on Windows are affected...

Place creates a smart object, and smart objects obey special rules. The most important to know about is that it honors physical sizes as defined by the ppi number, not native pixel dimensions.

In other words, you may get unintentional scaling if you don't watch the ppi numbers.

Why are you using Place? Is there any particular reason you're not simply opening the jpeg? Then Export and Save will match.