add average option in cp3

Author: gletort

src/main/java/fiji/plugin/appose/ApposeUtils.java

@@ -192,14 +192,16 @@ public static void displayParameters( final Map< String, Object > inputs )
 		System.out.println( "─".repeat( 50 ) );
 	}
 
-	public static List< String > getChannelChoices( ImagePlus imp )
+	public static List< String > getChannelChoices( ImagePlus imp, boolean cp3_mode )
 	{
 		List< String > channelChoices = new ArrayList<>();
 		for ( int i = 1; i <= imp.getNChannels(); i++ )
 		{
 			channelChoices.add( String.valueOf( i ) );
 		}
 		channelChoices.add( "None" );
+		if ( cp3_mode )
+			channelChoices.add( "Average" );
 		return channelChoices;
 	}
 

src/main/java/fiji/plugin/appose/cellpose/cp3/CellposeAppose.java

@@ -151,7 +151,7 @@ public void initialize()
 
 		is3D = ApposeUtils.is3d( imp );
 
-		List< String > channelChoices = ApposeUtils.getChannelChoices( imp );
+		List< String > channelChoices = ApposeUtils.getChannelChoices( imp, true );
 
 		// Set the max possible value of channels based on image dimension
 		final MutableModuleItem< String > cytoItem =

src/main/java/fiji/plugin/appose/cellpose/cp4/CellposeSAMAppose.java

@@ -165,7 +165,7 @@ public void initialize()
 		if ( nchanels > 3 )
 		{
 			IJ.showMessage( "Cellpose SAM can only handle 3 channels, pick the 3 channels to feed to the model." );
-			List< String > channelChoices = ApposeUtils.getChannelChoices( imp );
+			List< String > channelChoices = ApposeUtils.getChannelChoices( imp, false );
 
 			chan0 = new DefaultMutableModuleItem<>( getInfo(),
 					"Channel 0", String.class );