ARW (Sony Alpha Raw) is a raw, uncompressed image file format mostly used by Sony Alpha cameras. In this format, the data is saved using TIFF specifications. To open an ARW file, it, first of all, needs to be edited by a program such as Adobe Photoshop Elements.
BMP, also called a bitmap image, is a raster image file format developed by Microsoft Corporation for its Windows operating system. Typically, BMP is used to save bitmap digital images in a display device and can save two-dimensional photos in monochrome and color. Although most BMP files have significant file sizes because of lack of data compression, they can be compressed losslessly via algorithms like ZIP.
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