Photoshop changes image size and resolutions when exporting as jpeg

[JoyfulRat]

As the title says.

When I try to export an image as a jpeg, Photoshop changes its size and resolution. I've tried looking around for a solution, which apparently used to be to simply use Save As instead of Export, but since Photoshop now only offers .PSD .PSB, .PDF and .TIFF file formats when using Save As, that method doesn't seem doable anymore. 

Ideas?

[Stephen_A_Marsh · Accepted solution]

You either need to use Save a Copy or enable Legacy Save As in Preferences > File Handling

Note: As long as the image isn't in 32bpc mode, which would require tone mapping beforehand for Save As/Save a Copy to be accessible, while Export As will automatically perform tone mapping using Exposure 0 + Gamma 1.00 to allow direct export from 32bpc data.

[JoyfulRat]

Thank you very much! I didn't know about either of those options, but after testing both, they work perfectly. 

[D Fosse]

Yes, it sounds like you have a 32 bit file.

Either way, Export does not change image size. But it strips the pixels per inch value. Export is for web/screen/mobile devices, where ppi is irrelevant and not needed. So it's removed.

A file coming out of Export does not have a ppi value at all, not 300, not 72, not anything. When you reopen that file in another application, a default number may be assigned. Photoshop assigns 72 by default.

[JoyfulRat]

Ohh I see! That's interesting to know, thank you very much! I did wonder about that. 

[Derek Cross]

This useful video explains the different ways of Saving and Exporting from Photoshhop and why you may choose a particular method:
https://youtu.be/5CS_oieQL7c?si=xgcTK6dPpi3Oj7RL

[Stephen_A_Marsh]

A script can add the missing resolution metadata back into JPEG images that have been exported:

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...

I really wish that Adobe would just add a checkbox to Export As to let the end user decide whether they wish to include or exclude resolution metadata.

At the moment it's buggy, PNG includes resolution metadata and JPEG doesn't, even though both formats are capable of including this metadata:

https://community.adobe.com/t5/photoshop-ecosystem-bugs/ps-2024-export-png-now-retains-resolution-me...