How to auto adjust images in imageJ?

Question

Hello,
I would like to know How can I adjust the contrast and brightness in imageJ using a Java application?
imageJ has ContrastAdjuster.java and inside it an autoAdjust function which is not public, so I cannot call it? any one has experience with this?
Best Regards,

Answer 1

Your calling class needs to be at that access modifier allowance ,
since your caller probably isn't,
you can make a small class with that access level(no specifier - is between protected and private) to join it that you can reference with your caller package level,
or probably better, a nested class of that access level in your caller class with global scope instantiation in your caller.
*// not all syntax is here - This just to give you a guide of the type of access specifier shuffling and reprocessing to obtain the methods variables at the same level as obtaining the ability to call the method , it may be more practical to target the class in imageJ that instantiates the ContrastAdjuster class and simply obtain its reference to ContrastAdjuster*
*//ContrastAdjuster adj - should be passed from wherever it is instantiated , presumably its in a higher level class frame in the application*
public class IwasCalling{
CallAutoAdjuster callAUTContraster;
public IwasCalling(ContrastAdjuster adj){
callAUTContraster = new CallAutoAdjuster();
//start nested class
class CallAutoAdjuster{
void callAutoAdjuster(){
autoAdjust(imp,ip); // ImagePlus imp , ImageProcessor ip
}//end method
}//end nested
}//end iwascalling
Edited by: 893871 on Nov 3, 2011 6:53 PM
After taking a good look at the .java files
--i find the doAutoAdjust variable requires to be set in the public class ContrastAdjuster and call notify()--
..and i have no idea how i lost the plot there... it was the contrast slider value you wanted
so a method would be from some class you create
// contr is the reference to the ij plugin frame extended from JFrame that ContrastAdjuster.java extends from
public int adJustContrast(int slideVal){ // this listener method sets an int in  ContrastAdjuster public synchronized void adjustmentValueChanged(AdjustmentEvent e)
// with the line contrastValue = contrastSlider.getValue();
// int sliderRange = 256; this global int is divided by two appears to be the Max for contrast and the or a scrollbar appears to be a make-shift slider value changer
contr.contrastValue = slideVal; // global accessible int in ContrastAdjuster
return contr.contrastValue;
public boolean adjAuto(){
contr.doAutoAdjust = true;
return contr.doAutoAdjust;
public void updateNotifyComm(){ // now update the app
contr.notify();
//............... so you would call from somewhere to do it by this after making those methods
adJustContrast(contr.contrastSlider.getValue());
updateNotifyComm(); // or just running code of contr.notify();
// i have no idea how that became boolean  doAutoAdjust in my mind
// for auto adjust
adjAuto();
updateNotifyComm();Edited by: 893871 on Nov 3, 2011 8:15 PM
Edited by: 893871 on Nov 3, 2011 8:17 PM
Edited by: 893871 on Nov 3, 2011 8:23 PM