Beyond storing your images, the Photo app that comes pre-installed on iPhones is also an incredibly powerful editing tool. You can crop images, apply filters, tweak their exposure and brightness settings, rotate them, remove red eyes, and more. However, you may have noticed that no “invert” option appears when you launch the Photos app, open an image, and tap the Edit button at the top-right corner of the screen.
You can invert the colors of your iPhone by heading to your iPhone’s Settings > Accessibility > Display & Text Size and toggling on the switch next to Classic Invert. Since your images will appear inverted when you’ve enabled Classic Invert, you may attempt to screenshot it. Sounds easy, right? Unfortunately, the images will return to their original form as soon as you disable Classic Invert. Ultimately, this means that the only way you can invert an image on your iPhone is to resort to a third-party app.