PPM (Portable Pixmap) is an image format developed by Jef Poskanzer. It contains human-readable text with an image header and body. Usually, the header includes the image contents such as the maximum color value, number of rows and columns, and the P3, which defines the image format. The image body, on the other hand, entails the actual picture data in a series of RGB values.
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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