You can magnify an element of an image using a tool that exists in Photo on both Mac and iOS systems. This is useful if you want to focus attention within the image.

How to magnify part of an image in Photos

This is how to get to and use the Loupe/Shapes tool on both Mac and iOS devices:

• Select the image and tap Edit
• Tap the Extensions (…)button
• Select Markupand click the Shape button, then the Loupe button (Mac)
• On iOS, you should tap the Plusbutton and then choose the Magnifierbutton after selecting Markup

Now drag the loupe to the area of the image you want to magnify, you can also make the selected area larger by dragging the circles.

Also read: A useful Photos printing shortcut