MacOS not opening photos “because it is from an unidentified developer”?

It's Picelmator Pro that's causing the problem, not the image file. Control (right) - click on Piclemator Pro and select Open from the contextual menu. In the next window click Open. That only had to be done once and from them on it'll open when you click on an image file.

If you go to a folder with your photos (assuming .jpg) right click or command click it and select 'Get Info'. Select what app you want to be default and then click on the 'Change All' Button. (If you want 'Pixelmator Pro', choose that. Or if you prefer 'Preview', choose that. Or any other photo view/edit software)

ArmandoWyo wrote:

When set photo to be opened with Pixelmator Pro, then click open, I now often get photo “cannot be opened because it is from an unidentified developer. macOS cannot verify that this app is free from malware”?

But, if instead I open the same photo directly in Pixelmator Pro, it opens w/o problem. Also opens w/o problem in Preview.

The refusal to open are only when select in Finder that photo is to be opened in Pixelmator Pro instead of Preview.

But, should I decide w/n to open after a warning? No way to override MacOS?

I am sometimes also getting the popup warning that the photo “is damaged and can’t be opened. You should move it to the Trash. Pixelmator Pro created this file on [date].

In each case, photo opened OK in Preview and opened w/o problem or damage in Pixelmator Pro. Again only happens after select in Finder that photo is to be opened in Pixelmator Pro instead of Preview.

Suggestions? Thanks.

Old issue, new issue, what changed...?

For your third party app—if in doubt search the developers website or contact their: Support/Help/FAQ/Known issues/compatibility/updates/ or uninstaller

Contact a third-party vendor - Apple Support

Contact a third-party vendor - Apple Support

ref

Pixelmator Support

Pixelmator Pro Help

FAQ - Pixelmator Pro

Intro to Pixelmator Pro - Pixelmator Pro User Guide

ArmandoWyo wrote:

Old Toad, Thanks, but didn't change it. I got the first option, clicked open, but not the scene saying that app was downloaded from internet and asking if still wanted to open. instead just opened PixelmatorPro. ???

did i do something wrong?

What Old Toad showed is something that should occur only once - the very first time you open an application in your mac. Besides, Pixelmator Pro is an app available from the App Store, so I am not even sure this should appear.

It seems that you control-clicked, chose Open With->Pixelmator Pro and it opened, right? That is how it's supposed to happen. Now does the same problem continue to occur if you set the file to open with Pixelmator Pro?

What version is it? Is it up to date?