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

@D Fosse

But first 4x screenshot are from Illustrator - images should be placed at 100% - no matter what PPI...

The first four "Link" screenshots look correct - the higher the ppi, the lower the scale. If 72 is 100%, then 144 should be 50%, and so on. Remember, Place in InDesign honors the physical size, and that is determined by the ppi number.

But again, your last screenshot shows this weird 72 ppi bug.

I can't see anything wrong aside from that.

@D Fosse 

To be clear: Save For Web and Export do not set any ppi. The ppi metadata are stripped. A file coming out of Export/SFW does not have a ppi at all, not 72, not 96, not 300, not anything.

Looks like it.

You're correct that there is a strange bug with jpegs saved with an embedded ppi number of exactly 72. But aside from that, I could not see any unexpected behavior when placing jpegs in InDesign.

It looks like only in InDesign - Illustrator is importing "correctly" - higher ppi = smaller file - but please check SCALE value for each PPI:

If the PPI is set in the JPEG - and is recognised by Illustrator - why it shows that imported image is scaled down??

It should be 100% - no matter what PPI "inside" the image is??

Or am I missing something??

So the bug is only in the InDesign - effect after Place:

Act(ual)

Eff(ective)

(size after Place in inches)

72, 100, 144, 288:

1st - 72 - should be much larger - but is the same size as 144...

To be clear: Save For Web and Export do not set any ppi. The ppi metadata are stripped. A file coming out of Export/SFW does not have a ppi at all, not 72, not 96, not 300, not anything.

When there is no ppi number, many applications assume a default value for internal purposes, like calculating font sizes and so on. Adobe applications assign 72. Microsoft applications assign 96.

You're correct that there is a strange bug with jpegs saved with an embedded ppi number of exactly 72. But aside from that, I could not see any unexpected behavior when placing jpegs in InDesign.

OK. It looks like SAVE AS saves PPI info in the JPEG file - SAVE FOR WEB - strips it or sets it to 72ppi.

@D Fosse 

Have you checked my last screenshots??

Even with 100 DPI / PPI - it imports INCORRECTLY - but this time it's not 50%.

@Robert at ID-Tasker 

OK, I finally got around to trying it. Yes, you're right. Save As jpeg does indeed place in ID at 50% size - but only if the ppi number is exactly 72!

Change ppi to 71, and it behaves correctly.

So, as the conclusion also seems to be in the ID thread, this has to be a weird bug. I have no explanation for this.

(BTW, the Explorer screenshot showing 96 ppi - that's just Microsoft's default when there is no ppi number. Open this in PS or ID, and it will come in as 72 ppi).

@D Fosse 

100 DPI / PPI files:

Inside:

Outside:

@D Fosse 

Just in case - screens from Bridge 2024:

@D Fosse 

What is wrong with this forum??

InDesign's part is working fine - I can reply and quote the person I'm responding to - here, I can only respond to and quote my original post?!?!?

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.

OK, so here is the kicker:

SAVE AS - 72DPI - imports 50%:

SAVE FOR WEB - 96DPI - import 100%:

Would you like to revise your comment??

Can't attache files here - again, what is wrong here ?!?! - so please check here:

https://community.adobe.com/t5/indesign-discussions/why-does-a-1024x1024-pixel-image-when-placed-in-a-1024x1024-indesign-document-need-resizing/m-p/14495574#M566401