Changeset 39278

Timestamp:

Dec 16, 2015, 9:40:10 AM (11 years ago)

Author:

eugene

Message:

flip sign of ubercal correction when combined with Mflat

File:

• trunk/Ohana/src/uniphot/src/cam_zpt_correction.c (modified) (1 diff)

trunk/Ohana/src/uniphot/src/cam_zpt_correction.c

@@ -385 +385 @@
         float delta = FlatCorrectionOffset (flatcorr, ID, chipX, chipY);
 
-        values[jx + jy*NxModel] += delta;
+        // note that Eddie's offset is defined so that Mrel = Mcat + offset
+        // while my flatfield dM is defined so that dM = Mcat - Mrel or Mrel = Mcal - dM
+        // note that in the old code, measure.Mcal = -offset and Mrel = Mcat - Mcal
+        values[jx + jy*NxModel] -= delta;
       }
     }