Before adding BLUE_SKY to DSI_MAIN

src/main/java/com/elphel/imagej/tileprocessor/QuadCLT.java

@@ -846,7 +846,8 @@ public class QuadCLT extends QuadCLTCPU {
 			final double      photo_offs,     // 21946; // weighted average offset target value, if photo_offs_set (and not photo_offs_balance)
 			final int         num_refines, // 2
 			final int         min_good,     // minimal number of "good" pixels
-			final double [][] combo_dsn_final,     // double [][]    combo_dsn_final, // dls,			
+			final double [][] combo_dsn_final,     // double [][]    combo_dsn_final, // dls,
+			final boolean[]   blue_sky,
 			int               threadsMax,
 			final boolean     debug)
 	{
@@ -861,6 +862,11 @@ public class QuadCLT extends QuadCLTCPU {
 					disparity_ref[i] = Double.NaN;
 				}
 			}
+			if (blue_sky != null) {
+				for (int i = 0; i < blue_sky.length; i++) if (blue_sky[i]) {
+						disparity_ref[i] = 0.0;
+				}
+			}
 			
 			ImagePlus img_ref = renderGPUFromDSI(
 					-1,                 // final int         sensor_mask,