diff --git a/backend/genesys.cc b/backend/genesys.cc
index b30856c0e..fa74616ad 100644
--- a/backend/genesys.cc
+++ b/backend/genesys.cc
@@ -186,12 +186,11 @@ const Genesys_Sensor& sanei_genesys_find_sensor_any(Genesys_Device* dev)
 const Genesys_Sensor& sanei_genesys_find_sensor(Genesys_Device* dev, int dpi,
                                                 ScanMethod scan_method)
 {
-    bool is_transparency = scan_method == ScanMethod::TRANSPARENCY;
     for (const auto& sensor : *s_sensors) {
         if (dev->model->ccd_type == sensor.sensor_id &&
                 (sensor.min_resolution == -1 || dpi >= sensor.min_resolution) &&
                 (sensor.max_resolution == -1 || dpi <= sensor.max_resolution) &&
-                sensor.is_transparency == is_transparency) {
+                sensor.method == scan_method) {
             return sensor;
         }
     }
@@ -201,12 +200,11 @@ const Genesys_Sensor& sanei_genesys_find_sensor(Genesys_Device* dev, int dpi,
 Genesys_Sensor& sanei_genesys_find_sensor_for_write(Genesys_Device* dev, int dpi,
                                                     ScanMethod scan_method)
 {
-    bool is_transparency = scan_method == ScanMethod::TRANSPARENCY;
     for (auto& sensor : *s_sensors) {
         if (dev->model->ccd_type == sensor.sensor_id &&
                 (sensor.min_resolution == -1 || dpi >= sensor.min_resolution) &&
                 (sensor.max_resolution == -1 || dpi <= sensor.max_resolution) &&
-                sensor.is_transparency == is_transparency) {
+                sensor.method == scan_method) {
             return sensor;
         }
     }
diff --git a/backend/genesys_devices.cc b/backend/genesys_devices.cc
index 8ae18e0a0..b2a10a2ca 100644
--- a/backend/genesys_devices.cc
+++ b/backend/genesys_devices.cc
@@ -1357,12 +1357,12 @@ void genesys_init_sensor_tables()
             int min_resolution;
             int max_resolution;
             int exposure;
-            int is_transparency;
+            ScanMethod method;
             GenesysRegisterSettingSet extra_custom_regs;
         };
 
         CustomSensorSettings custom_settings[] = {
-            { -1, 600, 8016, false, {
+            { -1, 600, 8016, ScanMethod::FLATBED, {
                     { 0x74, 0x00 }, { 0x75, 0x01 }, { 0x76, 0xff },
                     { 0x77, 0x03 }, { 0x78, 0xff }, { 0x79, 0xff },
                     { 0x7a, 0x03 }, { 0x7b, 0xff }, { 0x7c, 0xff },
@@ -1390,7 +1390,7 @@ void genesys_init_sensor_tables()
                     { 0x5a, 0x40 },
                 }
             },
-            { 1200, 1200, 56064, false, {
+            { 1200, 1200, 56064, ScanMethod::FLATBED, {
                     { 0x74, 0x0f }, { 0x75, 0xff }, { 0x76, 0xff },
                     { 0x77, 0x00 }, { 0x78, 0x01 }, { 0x79, 0xff },
                     { 0x7a, 0x00 }, { 0x7b, 0x01 }, { 0x7c, 0xff },
@@ -1418,7 +1418,7 @@ void genesys_init_sensor_tables()
                     { 0x5a, 0x40 },
                 }
             },
-            { 2400, 2400, 56064, false, {
+            { 2400, 2400, 56064, ScanMethod::FLATBED, {
                     { 0x74, 0x0f }, { 0x75, 0xff }, { 0x76, 0xff },
                     { 0x77, 0x00 }, { 0x78, 0x00 }, { 0x79, 0x00 },
                     { 0x7a, 0x00 }, { 0x7b, 0x00 }, { 0x7c, 0x00 },
@@ -1446,7 +1446,7 @@ void genesys_init_sensor_tables()
                     { 0x5a, 0x40 },
                 }
             },
-            { 4800, 4800, 42752, false, {
+            { 4800, 4800, 42752, ScanMethod::FLATBED, {
                     { 0x74, 0x0f }, { 0x75, 0xff }, { 0x76, 0xff },
                     { 0x77, 0x00 }, { 0x78, 0x00 }, { 0x79, 0x00 },
                     { 0x7a, 0x00 }, { 0x7b, 0x00 }, { 0x7c, 0x00 },
@@ -1474,7 +1474,7 @@ void genesys_init_sensor_tables()
                     { 0x5a, 0x40 },
                 }
             },
-            { -1, -1, 15624, true, {
+            { -1, -1, 15624, ScanMethod::TRANSPARENCY, {
                     { 0x74, 0x00 }, { 0x75, 0x1c }, { 0x76, 0x7f },
                     { 0x77, 0x03 }, { 0x78, 0xff }, { 0x79, 0xff },
                     { 0x7a, 0x03 }, { 0x7b, 0xff }, { 0x7c, 0xff },
@@ -1510,7 +1510,7 @@ void genesys_init_sensor_tables()
             sensor.min_resolution = setting.min_resolution;
             sensor.max_resolution = setting.max_resolution;
             sensor.exposure_lperiod = setting.exposure;
-            sensor.is_transparency = setting.is_transparency;
+            sensor.method = setting.method;
             sensor.custom_regs = base_custom_regs;
             sensor.custom_regs.merge(setting.extra_custom_regs);
             s_sensors->push_back(sensor);
@@ -1626,13 +1626,13 @@ void genesys_init_sensor_tables()
             int min_resolution;
             int max_resolution;
             int exposure;
-            int is_transparency;
+            ScanMethod method;
             GenesysRegisterSettingSet extra_custom_regs;
             GenesysRegisterSettingSet custom_fe_regs;
         };
 
         CustomSensorSettings custom_settings[] = {
-            { -1, 1200, 0x5dc0, false, {
+            { -1, 1200, 0x5dc0, ScanMethod::FLATBED, {
                     { 0x74, 0x03 }, { 0x75, 0xf0 }, { 0x76, 0xf0 },
                     { 0x77, 0x03 }, { 0x78, 0xfe }, { 0x79, 0x00 },
                     { 0x7a, 0x00 }, { 0x7b, 0x92 }, { 0x7c, 0x49 },
@@ -1661,7 +1661,7 @@ void genesys_init_sensor_tables()
                 },
                 {},
             },
-            { -1, 1200, 0x5dc0, true, {
+            { -1, 1200, 0x5dc0, ScanMethod::TRANSPARENCY, {
                     { 0x74, 0x03 }, { 0x75, 0xf0 }, { 0x76, 0xf0 },
                     { 0x77, 0x03 }, { 0x78, 0xfe }, { 0x79, 0x00 },
                     { 0x7a, 0x00 }, { 0x7b, 0x92 }, { 0x7c, 0x49 },
@@ -1690,7 +1690,7 @@ void genesys_init_sensor_tables()
                 },
                 {},
             },
-            { 2400, 2400, 0x5dc0, true, {
+            { 2400, 2400, 0x5dc0, ScanMethod::TRANSPARENCY, {
                     { 0x74, 0x03 }, { 0x75, 0xfe }, { 0x76, 0x00 },
                     { 0x77, 0x03 }, { 0x78, 0xfe }, { 0x79, 0x00 },
                     { 0x7a, 0x00 }, { 0x7b, 0x92 }, { 0x7c, 0x49 },
@@ -1719,7 +1719,7 @@ void genesys_init_sensor_tables()
                 },
                 {},
             },
-            { 4800, 4800, 0x5dc0, true, {
+            { 4800, 4800, 0x5dc0, ScanMethod::TRANSPARENCY, {
                     { 0x74, 0x03 }, { 0x75, 0xff }, { 0x76, 0xff },
                     { 0x77, 0x03 }, { 0x78, 0xff }, { 0x79, 0xff },
                     { 0x7a, 0x00 }, { 0x7b, 0x92 }, { 0x7c, 0x49 },
@@ -1758,7 +1758,7 @@ void genesys_init_sensor_tables()
         {
             sensor.min_resolution = setting.min_resolution;
             sensor.max_resolution = setting.max_resolution;
-            sensor.is_transparency = setting.is_transparency;
+            sensor.method = setting.method;
             sensor.exposure_lperiod = setting.exposure;
             sensor.custom_regs = base_custom_regs;
             sensor.custom_regs.merge(setting.extra_custom_regs);
diff --git a/backend/genesys_low.h b/backend/genesys_low.h
index eb76a90f0..a4318d705 100644
--- a/backend/genesys_low.h
+++ b/backend/genesys_low.h
@@ -218,6 +218,13 @@
 
 #define GENESYS_MAX_REGS 256
 
+enum class ScanMethod {
+    // normal scan method
+    FLATBED = 0,
+    // scan using transparency adaptor
+    TRANSPARENCY = 1
+};
+
 struct GenesysRegister {
     uint16_t address = 0;
     uint8_t value = 0;
@@ -559,8 +566,8 @@ struct Genesys_Sensor {
     int min_resolution = -1;
     int max_resolution = -1;
 
-    // whether the sensor is transparency sensor.
-    bool is_transparency = false;
+    // the scan method used with the sensor
+    ScanMethod method = ScanMethod::FLATBED;
 
     // CCD may present itself as half or quarter-size CCD on certain resolutions
     int ccd_size_divisor = 1;
@@ -900,13 +907,6 @@ enum Genesys_Motor_Type
   MOTOR_CANONLIDE120
 };
 
-enum class ScanMethod {
-    // normal scan method
-    FLATBED = 0,
-    // scan using transparency adaptor
-    TRANSPARENCY = 1
-};
-
 /* Forward typedefs */
 typedef struct Genesys_Device Genesys_Device;
 struct Genesys_Scanner;