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3FR is a raw image file format used by Hasselblad digital cameras, capturing all the data as sensed by the camera's sensor without processing or compression. This format allows for extensive post-processing capabilities, offering photographers greater control over image adjustments such as exposure, color balance, and detail, but results in larger file sizes compared to standard compressed image formats.

ICO is a file format used to store icons on Microsoft Windows. It supports images of various sizes and color depths, and it can contain multiple images within a single file, allowing icons to be displayed in different resolutions and color depths depending on the user’s settings. While ICO files are essential for creating application and file icons in Windows, they are less commonly used for other purposes due to their specific functionality and limited support on non-Windows platforms.