Data Access
n public abstract void setPixel(int x,
n                               int y,
n                               int plane,
n                               double pix)
Pixel information in range -1 to +1
n public void setSubImage(int x,
n                         int y,
n                         int z,
n                         Jimage im)
Update an area of an image with another one. The other one must
not run off the edge of the one being written to. The source of the
copying is the 0th plane of the source jimage.