ch as OSX, Windows
       and Solaris, read/write with memory for JPEG, PNM and JP2 goes
       through temp files.
   To enable/disable memory I/O for image read/write, see environ.h.

   We also provide fast serialization and deserialization between a pix
   in memory and a file (spixio.c).  This works on all types of pix images.

10. Colormap removal and color quantization

   Leptonica provides functions that remove colormaps, for conversion
   to either 8 bpp gray or 24 bpp RGB.  It also provides the i