The current pixel coloring scheme (different colors for positive, zero, and negative) works well for log-ratios coming from microarray data. For other kinds of data, however, this coloring scheme may not be suitable. In our case, for example, all data are absolute and vary from a small positive value to a huge positive value. In this case, a logarithmic coloring scheme (such as available in GeneSpring) may be more appropriate. Here, the color is not based on the value itself, but on the logarithm of the value. Converting the data to logarithms before loading them into Java TreeView is not an optimal solution, since we would like to see the actual value (not the logarithm) when hovering over them with the mouse.