This tool allows you to extend the borders of an image to fit a specific frame size. If your photo is too small for your layout, InDesign uses AI to "paint" the missing areas based on the existing image context.
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In a different context, (Generic Patcher) is an open-source, community-developed tool used to modify Adobe Creative Cloud applications on Windows. Extend images with Generative Expand in Adobe InDesign genp indesign