int number = 155897;//max number of Pixels
HistogramDataset dataset = new HistogramDataset(); //create a Histogram
dataset.setType(HistogramType.RELATIVE_FREQUENCY);
dataset.addSeries("Histogram",doubleArray,number);
String plotTitle = "Histogram";
String xaxis = "pixel";
String yaxis = "intensity";
PlotOrientation orientation = PlotOrientation.VERTICAL;//sets the vertical orientation of the Histogram
boolean show = false;
boolean toolTips = false;
boolean urls = false;
JFreeChart chart = ChartFactory.createHistogram( plotTitle, xaxis, yaxis,
dataset, orientation, show, toolTips, urls);
int widthg = 500;
int heightg = 300;
try {
ChartUtilities.saveChartAsPNG(new File("histogram41.PNG"), chart, widthg, heightg);
} catch (IOException e) {}
}}