I have several photo on my iMac that have turned white and the number increases as time goes on, the information is on the photo, but just a white image.

Hey jitterbugdancer,

It sounds like you're having issues with photos showing blank on your Mac. We can understand wanting to look into that further. We want to help.

Did you have the chance to follow the steps below from the article viewed before posting? Get help with the Photos app on your Mac

"If the Media Browser isn't showing your photos and videos

Use the Media Browser to make images from your photo library available in other apps, like Pages and iMovie. The Media Browser shows only the contents of the Photos library designated as the System Photo Library. If you have more than one Photos library—and the one you're using isn't set as the System Photo Library—the Media Browser won't show its contents.

Follow these steps to designate the current library as the System Photo Library:

1. Choose Photos > Preferences.
2. Click the General button at the top of the Preferences window.
3. Click Use as System Photo Library."

Thanks!