I am looking for an image view program for Mac that can handle large images. I used to use preview but, since "upgrading" to Mojave, preview will not display large
I suggest Phiewer to try. Not sure how large an image it handles but it will open and display a 1920 x 1080 image ad I suppose larger. The basic version of the App is free so its at least worth a try. If you say how large an image you want to open I could give you another option if needed.