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HDR (Radiance RGBE image format) is an image file format designed to store images with a broad range of luminance levels, from deep shadows to bright highlights, capturing more detail in both areas than standard digital imaging formats. This format is commonly used in photography and computer graphics to achieve more realistic or artistically enhanced representations of light in images. However, HDR files can be larger in size, and they require compatible software and displays to fully appreciate the enhanced dynamic range.

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.