ImageJ opening imagePlus window as an internal frame inside a desktopPane

Question

I am having some trouble in ImageJ with one of its files. Basically set up a desktop pane that analyzes and opens images. But when the program opens the image it opens it as

Answer 1

The creation of a new JFrame is hardcoded into ImageJ's ImagePlus class:

if (stackSize>1)
    win = new StackWindow(this);
else
    win = new ImageWindow(this);

If you want to adapt the GUI, you can extend the ImageWindow or StackWindow classes. See the Trainable Weka Segmentation plugin for a nice example.

Alternatively, use the data structures of ImageJ2, namely ImgLib's ImgPlus. These are designed to be independent of any user interface.