Miker you will make a good part of the Aros community, a program for a long time like Raystorm, I thank you Meanwhile I proceed with my humble collaboration projects 
Thank you for your support.
As I finish up modifications to TGA, PCX and BMP Datatypes I'm doing a study of compression schemes used in datatypes.

These include ByteRun, RLE, LZW, Huffman and CCIT. I just finished writing a version of PCX RLE encoding that is currently working to compress scanlines for PCX Datatype. The datatype can save 8bit and 24bit PCX files. RLE isn't required for TGA but I'd like to experiment with WriteRLE for Targa Datatype as well.
Of course, in time, I will need working versions of RLE and LZW compression for use with TIFF Datatype. The first version of the datatype will use LibTiff. The updated version will have an internal decoder for loading and saving. Multi-Image Tiff Files.