diff --git a/JFSphoto.py b/JFSphoto.py
index e6a4b17..b37d4e1 100644
--- a/JFSphoto.py
+++ b/JFSphoto.py
@@ -294,7 +294,7 @@ class Jfsphoto (object):
 
     
     def do_math(self):
-        stati = [("Raw",1),("Raw + Baseline",2),("Transmission",4),("Absorption",3)]
+        stati = [("Raw",1),("Raw + Baseline",2),("Transmission",4),("Absorbanz",3)]
         
         win = tk.Toplevel()
         self.center = tk.Frame(win, bg='gray2', width=50, height=40, padx=3, pady=3)
@@ -355,7 +355,7 @@ class Jfsphoto (object):
             self.get_kin_list()
             self.do_get_range()
             for xx in self.col_list:
-                self.do_absorption(xx)
+                self.do_absorbanz(xx)
             for xx in self.col_list:
                 self.do_transmission(xx)
             return True
@@ -401,7 +401,7 @@ class Jfsphoto (object):
                 if (self.left==0 and count > 5):
                     self.left=i
 
-    def do_absorption(self,xx):
+    def do_absorbanz(self,xx):
         y = self.df['darkline'] - self.df[xx]
         b = self.df['baseline']
         c = np.zeros(3694, np.float32)
@@ -409,7 +409,8 @@ class Jfsphoto (object):
             if b[i]==0:
                 c[i] = 1
             else:
-                c[i] = y[i]/b[i]
+                #c[i] = y[i]/b[i]
+                c[i] = np.log10(b[i]/y[i])
         self.df[xx+'_abs'] = c
 
     def do_transmission(self,xx):
@@ -420,7 +421,8 @@ class Jfsphoto (object):
             if b[i]==0:
                 c[i] = 1
             else:
-                c[i] = np.log10(b[i]/y[i])
+                c[i] = y[i]/b[i]
+                #c[i] = np.log10(b[i]/y[i])
         self.df[xx+'_trans'] = c
 
     def look(self):
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