diff --git a/tasks/item/slider.py b/tasks/item/slider.py
index 9d4e8b950..af3c47ffe 100644
--- a/tasks/item/slider.py
+++ b/tasks/item/slider.py
@@ -49,7 +49,7 @@ class Slider:
         total = area[2] - area[0]
 
         parameters = {
-            'prominence': 15,
+            'prominence': 10,
             'wlen': wlen,
             'width': 2,
             'distance': wlen / 2,
@@ -58,6 +58,7 @@ class Slider:
         peaks, _ = signal.find_peaks(image, **parameters)
         peaks //= wlen
         diff = np.diff(peaks)
+        # print(diff)
 
         # Mask controller
         # Controller has orange border (240, 150, 57) and white center
diff --git a/tasks/item/synthesize.py b/tasks/item/synthesize.py
index d1683e8b5..c85cfcb64 100644
--- a/tasks/item/synthesize.py
+++ b/tasks/item/synthesize.py
@@ -37,7 +37,7 @@ def image_color_count(image, color, threshold=221):
 class WhiteStrip(Ocr):
     def pre_process(self, image):
         mask = color_similarity_2d(image, color=(255, 255, 255))
-        mask = cv2.inRange(mask, 180, 255, dst=mask)
+        mask = cv2.inRange(mask, 160, 255, dst=mask)
 
         mask = np.mean(mask, axis=0)
         point = np.array(cv2.findNonZero(mask))[:, 0, 1]
@@ -52,6 +52,13 @@ class SynthesizeItemName(OcrItemName, WhiteStrip):
     pass
 
 
+class SynthesizeItemAmount(Digit, WhiteStrip):
+    def pre_process(self, image):
+        image = super().pre_process(image)
+        image = cv2.subtract((255, 255, 255, 0), image)
+        return image
+
+
 class SynthesizeInventoryManager(InventoryManager):
     @cached_property
     def dic_item_index(self):
@@ -359,7 +366,7 @@ class Synthesize(CombatObtain, ItemUI):
         logger.hr('Synthesize amount set', level=2)
         slider = Slider(main=self, slider=SYNTHESIZE_SLIDER)
         slider.set(value, total)
-        ocr = Digit(SYNTHESIZE_AMOUNT, lang=server.lang)
+        ocr = SynthesizeItemAmount(SYNTHESIZE_AMOUNT, lang=server.lang)
         self.ui_ensure_index(
             value, letter=ocr, next_button=SYNTHESIZE_PLUS, prev_button=SYNTHESIZE_MINUS, interval=(0.1, 0.2))