Where's the Histogram

Question

Greetings folks!
Need a little help to see if there is a simple solution. I've applied a levels filter to some footage and want to use the histogram to guide me. However, the histogram isn't showing up. I see the filter in the inspector, but no histogram. I can make the shadow/mid/high adjustments, but would like to have the histogram to reference.
Anyone else have this issue?
Thanks for any assistance you can provide.

Answer 1

import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.media.jai.*;
import javax.swing.*;
* A class to plot histograms (primarily)
* Single band per object (bar chart)
* @author Dennis Sigel
public class XYPlot extends JComponent {
private int[] data;
private int max;
* Default constructor
public XYPlot() {
super();
private void setData(int[] array) {
data = new int[array.length];
max = -1;
for ( int i = 0; i < array.length; i++ ) {
data[i] = array;
if ( data[i] > max ) {
max = data[i];
public void plot(int[] array) {
setData(array);
repaint();
* Plotter
public synchronized void paintComponent(Graphics g) {
Graphics2D g2D = null;
if (g instanceof Graphics2D) {
g2D = (Graphics2D)g;
} else {
return;
if ( data == null ) return;
int width = getSize().width;
int height = getSize().height;
g2D.setColor(getBackground());
g2D.fillRect(0, 0, width, height);
g2D.setColor(Color.white);
int length = data.length;
float slope_x = (float) width / (float) length;
float slope_y = (float) height / (float) max;
for ( int i = 0; i < length; i++ ) {
int x = (int) ((float)i*slope_x);
int y = (int) ((float)data[i]*slope_y);
g.drawLine(x, height, x, height - y);