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The latest update to the free Microsoft OneNote for iPad app (www.apple.co/1JmQr6v) lets you search for text within an image, such as a photo of a page or magazine cover. This feature is already available in the PC version of OneNote and it works using OCR.

Open the app, tap the ‘+’ symbol at the top right to create a new section, then name it. Tap above the date and time (at the top left) to name your page within that section, then tap the main body of the section. Next, tap the Insert tab at the top, then Camera, point your iPad at the page/cover containing text and tap the shutter icon to take a picture. Finally, tap the tick icon at the bottom right to add this image to your page. You can now search for any text within that image by typing in the search bar at the top right then tapping the relevant page. All instances of that text in your image will be highlighted (see screenshot).