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PPM to HDR
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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.

HDR (Radiance RGBE image format) is an image file format designed to store images with a broad range of luminance levels, from deep shadows to bright highlights, capturing more detail in both areas than standard digital imaging formats. This format is commonly used in photography and computer graphics to achieve more realistic or artistically enhanced representations of light in images. However, HDR files can be larger in size, and they require compatible software and displays to fully appreciate the enhanced dynamic range.