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PEF is a raw image file format used by Pentax digital cameras. It stores the raw data from the camera’s sensor, providing high-quality images with minimal compression. PEF files are ideal for photographers who want to maintain maximum image quality and perform extensive post-processing adjustments.
ICO is an image file format used for storing icons in Windows operating systems. ICO files can contain multiple sizes and color depths of the same icon, allowing the system to choose the appropriate version based on the display resolution. ICO files are commonly used for website favicons and desktop application icons.