Convert RLE to PHM

The RLE (Run-Length Encoded) file extension, associated with the Utah Raster Toolkit, is a lossless image compression format used primarily for 4 or 8-bit bitmap images. Developed at the University of Utah, it employs run-length encoding to compress data by reducing consecutive repeated values, making it efficient for simple graphics like icons and line drawings. Historically, it was widely used in early versions of Windows and CompuServe software.

The PHM file extension stands for Portable Float-map Image (16-bit half), a format used for storing High Dynamic Range (HDR) images with 16-bit half-precision floating-point values. This format is particularly useful in applications requiring precise color representation and extensive dynamic range, such as computer graphics, image processing, and scientific visualization. Originating from the Portable FloatMap (PFM) format, PHM was developed to provide a more efficient storage solution by utilizing half-precision floats, thereby reducing file size while maintaining significant detail and accuracy.