ImageJ Problem

gistfile1.java

File file = new File(path);

if (file.exists()) {
    ImagePlus image = IJ.openImage(file.getAbsolutePath());
    ImagePlus[] split = ChannelSplitter.split(image);

    if (split != null) {
        System.out.println("SPLIT OK");
    } else {
        System.err.println("SPLIT NULL");
    }
}

Hi,

here is an example Javascript to extract G channel.

imp = IJ.openImage('/Users/miura/Desktop/hela-cells.tif');
impsplit = ChannelSplitter.split(imp);
impG= impsplit[1];
impG.show();

'hela-cells.tif' is a RGB image you could download by File > Sample Images > hela-cells.tif.
You could test the above script by

Plugins > New > Javascript

and then copy& paste the code above, then

Macros > Evaluate Javascript

Kota