picture is correct on screen but prints in a mirror image

IF it’s a MAC, reset printing system:

On your Mac, choose Apple menu System Preferences, then click Printers & Scanners

Press and hold the Control key as you click in the list at the left, then choose “Reset printing system” from the menu that appears.

After you reset the printing system, the list of printers in Printers & Scanners preferences is empty.

Reinstall the print driver, only from the manufacturer, not Apple.

Here is some general Adobe [Mac and Win] info on printing problems,

https://helpx.adobe.com/photoshop/kb/troubleshoot-printing-problems.html

Simple reset: hold the space bar when you open the print window. It resets the print dialogs

if that doesn’t help -

Perhaps try resetting Photoshop preferences?

Resetting restores Photoshop's internal preferences, which are saved when Photoshop closes. If they become corrupt then various issues can occur.

Here’s some info on how to do that:

https://helpx.adobe.com/photoshop/using/preferences.html

And

https://community.adobe.com/t5/photoshop-ecosystem-discussions/quick-tips-how-to-reset-photoshop-preferences/td-p/12502668

You may want to backup your settings and your custom presets, brushes & actions before restoring Photoshop's preferences.

Here is general info that:  https://helpx.adobe.com/photoshop/using/preferences.html#BackupPhotoshoppreferences

Also take a look at the following article and check if that helps: 

https://helpx.adobe.com/photoshop/using/printing-color-management-photoshop1.html

It may even be time to reinstall Photoshop.

Use the Adobe CC cleaner tool to remove all traces first.

Uninstall Photoshop BUT make sure to choose the option “Yes, remove app preference”.

Once that process finishes, start the installation process and look into the “Advanced Options”. Uncheck “Import previous settings and preferences” and choose to “Remove old versions”.

I hope this helps

neil barstow, colourmanagement net :: adobe forum volunteer

google me "neil barstow colourmanagement" for lots of free articles on colour management

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I have the same problem. When I print a document in Photoshop (version 21.1.2) on a Macintosh (10.15.7). I get this behavior when printing both to a Canon inkjet printer and to a Brother laser printer.

I cannot find any "emulsion down" setting in the print dialog box or print settings.

Hi John,

Please specify the application that you are using.

Regards,

Sheena