What is ppm?
PPM, short for Portable Pixelmap, is an image graphic file that contains 24-bit colour data that has been formatted to a text format that assigns a number to each pixel, ranging from 0 to 65536. Besides the colour information, it stores the images dimensions, whitespace and max. colour value. It is often considered an inefficient format compared to other bitmap format as it doesn’t make use of compression, making it difficult to use for large images. Mime type: image/x-portable-pixmap, application/ppm, application/x-ppm, image/x-p, image/x-ppm
What is emf?
An EMF file, short for Extended (or Enhanced) Metafile Format, provides true device independency. An EMF file is basically a snapshot of a video display, taken at a certain moment, that maintains its dimensions no matter where it is used. Several applications, such as PaintShopPro8, Microsoft Picture and GraphicsConverterPro attempt to successfully capture this extension. Mime type: application/emf, application/x-emf, image/x-emf, image/x-mgx-emf, image/x-xbitmap
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