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PPM to DNG
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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.

DNG (Digital Negative) is an open-source raw image file format developed by Adobe, aimed at providing a universal and more standardized option for storing raw image data from digital cameras. This format enables extensive post-processing flexibility, allowing photographers to adjust exposure, color balance, and other settings while preserving image quality. DNG files also tend to be smaller in size compared to other raw formats, and they are widely supported across various software applications, making them a popular choice for photographers looking for both quality and compatibility.