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 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 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...

[jjhg_0051]

Hey. The people that work for Adobe aren't the smartest people of the bunch. I don't work for Adobe, but I have the solution for you. You have to go to dropdown Image, and Canvas Size or Image Size. Then, change the resolution you so desire, and when you export, it will adjust to that resolution. The reason why you have trouble is cause Adobe is trying to compensate the size of your canvas so when you keep changing the resolution during export settings, Adobe is trying to accomodate for the canvas size you chosen.

[Conrad_C]

You’re replying to a thread where the original poster already thanked someone for their correct answer…eight months ago.

Your reply is incorrect, because it has nothing to do with the canvas size. Other responders, last year, already correctly identified that the problem was with the wrong export method being used. Because the print-oriented export workflows do include ppi resolution information (which is appropriate), and the web-oriented export workflows do not (also appropriate, because ppi is has no use at all for web graphics).

So it turns out there is a logic to how Adobe has designed the software. The only problem is that the ppi-related differences between these workflows is not made clear to the user. But once you know, you know.

[NB, colourmanagement]

@Conrad_C very well put

Neil B