Color Appearance Model 2002 added (see issue 1572). Credits: JDesmis for the core (and hard work!), Hombre for the GUI tuning

rtgui/darkframe.cc

@@ -28,6 +28,8 @@ using namespace rtengine::procparams;
 
 DarkFrame::DarkFrame () : Gtk::VBox(), FoldableToolPanel(this)
 {
+	set_border_width(4);
+
 	hbdf = Gtk::manage(new Gtk::HBox());
 	darkFrameFile = Gtk::manage(new MyFileChooserButton(M("TP_DARKFRAME_LABEL"), Gtk::FILE_CHOOSER_ACTION_OPEN));
 	darkFrameFilePersister.reset(new FileChooserLastFolderPersister(darkFrameFile, options.lastDarkframeDir));