diff --git a/backend/genesys_gl847.c b/backend/genesys_gl847.c
index 4019a1541..8bff91384 100644
--- a/backend/genesys_gl847.c
+++ b/backend/genesys_gl847.c
@@ -361,6 +361,7 @@ gl847_setup_sensor (Genesys_Device * dev, Genesys_Register_Set * regs, int dpi)
   Sensor_Profile *sensor;
   int dpihw, i;
   uint16_t exp;
+  uint8_t val;
 
   DBGSTART;
   dpihw=sanei_genesys_compute_dpihw(dev,dpi);
@@ -411,6 +412,9 @@ gl847_setup_sensor (Genesys_Device * dev, Genesys_Register_Set * regs, int dpi)
   sanei_genesys_set_triple(regs,REG_CK3MAP,sensor->ck3map);
   sanei_genesys_set_triple(regs,REG_CK4MAP,sensor->ck4map);
 
+  r = sanei_genesys_get_address (regs, 0x17);
+  r->value = sensor->r17;
+
   DBGCOMPLETED;
 }
 
@@ -516,12 +520,22 @@ gl847_init_registers (Genesys_Device * dev)
   SETREG (0x68, 0x80);
   SETREG (0x69, 0x20);
   SETREG (0x6a, 0x20);
+
+  /* CK1MAP */
   SETREG (0x74, 0x00);
   SETREG (0x75, 0x00);
   SETREG (0x76, 0x3c);
+
+  /* CK3MAP */
+  SETREG (0x77, 0x00);
+  SETREG (0x78, 0x00);
+  SETREG (0x79, 0x9f);
+
+  /* CK4MAP */
   SETREG (0x7a, 0x00);
   SETREG (0x7b, 0x00);
   SETREG (0x7c, 0x55);
+
   SETREG (0x7d, 0x00);
   /* NOTE: autoconf is a non working option */
   SETREG (0x87, 0x02);
@@ -1470,10 +1484,6 @@ gl847_init_optical_regs_scan (Genesys_Device * dev,
   else
     r->value |= REG03_LAMPPWR;
 
-
-  r = sanei_genesys_get_address (reg, 0x19);
-  r->value = 0x50;
-
   /* BW threshold */
   r = sanei_genesys_get_address (reg, 0x2e);
   r->value = dev->settings.threshold;
@@ -4097,8 +4107,7 @@ gl847_warm_scan (Genesys_Device * dev)
 				 0,
 				 SCAN_FLAG_DISABLE_SHADING |
 				 SCAN_FLAG_DISABLE_GAMMA |
-				 SCAN_FLAG_IGNORE_LINE_DISTANCE |
-				 SCAN_FLAG_USE_OPTICAL_RES);
+				 SCAN_FLAG_IGNORE_LINE_DISTANCE);
 
   RIE (gl847_bulk_write_register
        (dev, dev->reg, GENESYS_GL847_MAX_REGS));
diff --git a/backend/genesys_gl847.h b/backend/genesys_gl847.h
index 02216edcd..c7f418a83 100644
--- a/backend/genesys_gl847.h
+++ b/backend/genesys_gl847.h
@@ -532,6 +532,7 @@ typedef struct {
   int expr;             /**> initial red exposure */
   int expg;             /**> initial green exposure */
   int expb;             /**> initial blue exposure */
+  uint8_t r17;		/**> TG width */
 } Sensor_Profile;
 
 /* *INDENT-OFF* */
@@ -543,9 +544,9 @@ static Sensor_Profile sensors[]={
 	{CIS_CANONLIDE200,  150,  2848, 240, 636, 340, 5144, 0, 255,  637,  637,  637},
 	{CIS_CANONLIDE200,  300,  1424, 240, 636, 340, 5144, 0, 255,  637,  637,  637},
 	*/
-	{CIS_CANONLIDE200,  600,  1432, 60, 159, 85, 5144, 255,  410,  275,  203},
-	{CIS_CANONLIDE200, 1200,  2712, 60, 159, 85, 5144, 255,  746,  478,  353},
-	{CIS_CANONLIDE200, 2400,  5280, 60, 159, 85, 5144, 255, 1417,  909,  643},
-	{CIS_CANONLIDE200, 4800, 10416, 60, 159, 85, 5144, 255, 2692, 1728, 1221},
+	{CIS_CANONLIDE200,  600,  1432, 60, 159, 85, 5144, 255,  410,  275,  203, 0x0a},
+	{CIS_CANONLIDE200, 1200,  2712, 60, 159, 85, 5144, 255,  746,  478,  353, 0x08},
+	{CIS_CANONLIDE200, 2400,  5280, 60, 159, 85, 5144, 255, 1417,  909,  643, 0x06},
+	{CIS_CANONLIDE200, 4800, 10416, 60, 159, 85, 5144, 255, 2692, 1728, 1221, 0x04},
 };
 /* *INDENT-ON* */