Renamed poc.java to POC.java
Endeavoured to add a couple of colour palettes in order to produce algorithm
based colours into the image. However, LinearOrderPalette and HueSaturationPallette results are not satisfactory for this purpose.
Changed RGB from byte to int value to get around ridiculousness of java
having signed byte values!
modified build.xml to enable image file name to be specified on command line
with -Dimage, but to default to POC.png if not specified.
Quick check of the documentation and update where required.