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PEF to PPM
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PEF stands for Pentax Electronic File, and it is a raw image file format used by Pentax digital cameras. This format stores unprocessed image data directly from the camera's sensor, allowing photographers to maintain a high level of control over image adjustments such as exposure, color balance, and sharpness during post-processing. PEF files provide the potential for higher image quality, as they preserve more information than standard compressed image formats.

PPM stands for Portable Pixmap, and it is a simple image format that is part of the Netpbm package. The PPM format stores color images in a plain text or binary format, representing pixel values with three numbers for red, green, and blue color channels. PPM files are easy to read and understand, but they can be large in size as they do not employ any form of compression, resulting in each pixel being represented by full color intensity values.