// ChangeColors
// This macro changes the value of pixels in the image
// or selection that are in the foreground color to the 
// background color. Use Edit>Undo to revert back to
// the original.

macro "Change Colors" {
    setupUndo();
    isSelection = selectionType!=-1;
    value = getPixel(0, 0);
    makeRectangle(0, 0, 1, 1);
    run("Fill");
    foreground = getPixel(0, 0);
    run("Clear");
    background = getPixel(0, 0);
    setPixel(0, 0, value);
    if (isSelection)
        run("Restore Selection");
    else
        run("Select None");
    if (bitDepth==24) {
        // not needed in ImageJ 1.34n or later
        foreground = foreground&0xffffff;
        background = background&0xffffff;
    }
    changeValues(foreground, foreground, background);
}