Changing Resolution Doesn't Work When I Save

[Outtacontext]

I'm trying to go from a large PSD file (in pixels) at 300dpi to a smaller JPG (in pixels) at 72dpi. I change the size and resolution in the Image Size dialogue box and save it as a jpg. But when I open the resized file, the smaller pixel dimensions are correct, but it's been saved at 300 dpi. I've never encountered this problem before. I can't get it to save at 72 dpi.

This only seems to be happening when I go from a PSD or PSB to a JPG. When I save it as a TIF, the resolution does change.

I'm using Photoshop version 26.2.0. And I have Legacy Save As... turned on.

[Stephen Marsh]

It's PPI, not DPI... Anyway, this isn't a direct fix, however, you can change the value of 300 to 72 in the following Photoshop or Bridge scripts:

Photoshop version:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/photoshop-script-to-add-missing-resol...

Bridge version:

https://community.adobe.com/t5/bridge-discussions/bridge-script-to-add-missing-resolution-metadata-t...

[LAMY2017 · Accepted solution]

O.C., I wasn't able to reproduce the problem. As a check, what does Inspector in the Preview app show for H and W dimensions, and pixels per inch?

[Outtacontext]

Ok, the Inspector in Preview says its 72 ppi! Sigh.

An update: today, the images seem to be loading quickly in the grant's website. Go figure.

[Bojan Živković]

Is there a specific reason to change the Resolution PPI to 72, given that this field will be ignored on the internet?

[Outtacontext]

Yes, I'm applying for a grant. And originally I kept the ppi at 300 for the reasons you stated. However, I noticed that the image wasn't loading. Then when I was actually able to change one image to 72, it loaded right away. The grant specifications tell you to upload images at 72, so they must know their system.