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ERF (Epson Raw File), is a raw image file format used by Epson digital cameras, capturing all the data directly from the camera’s sensor without any in-camera processing or compression. This format enables photographers to have extensive control over post-processing, allowing for adjustments to exposure, color balance, and other parameters to achieve the desired image quality. However, ERF files are typically larger in size compared to standard compressed image formats and require specialized software for viewing and editing.

The SUN file format is a raster image format primarily associated with Sun Microsystems. It's used for bitmap images and is known for its use in the Solaris operating system, an iteration of UNIX developed by Sun Microsystems. The format can support multiple color depths and is often identified by the ".sun" file extension.