TColorPalette.java

[forcar]

Could you do something a little more sensible in dealing with negative values for log plots. Just assign some default color (gray) to values <= 0, instead of value=0 as done now. As currently configured, even if zmin is set >0 the histogram is rejected for containing a negative value. Another improvement would be to allow zmin to be fixed while zmax is allowed to autoscale.