some refinement

100_Numpy_exercises_with_hints_with_solutions.md

@@ -680,9 +680,9 @@ print(F)
 ```python
 # Author: Fisher Wang
 
-w, h = 16, 16
+w, h = 256, 256
-img = np.random.randint(0, 256, (w, h, 3)).astype(np.ubyte)
+I = np.random.randint(0, 4, (w, h, 3)).astype(np.ubyte)
-colors = np.unique(img.reshape(-1, 3), axis=0)
+colors = np.unique(I.reshape(-1, 3), axis=0)
 n = len(colors)
 print(n)
 ```

100_Numpy_exercises_with_solutions.md

@@ -680,9 +680,9 @@ print(F)
 ```python
 # Author: Fisher Wang
 
-w, h = 16, 16
+w, h = 256, 256
-img = np.random.randint(0, 256, (w, h, 3)).astype(np.ubyte)
+I = np.random.randint(0, 4, (w, h, 3)).astype(np.ubyte)
-colors = np.unique(img.reshape(-1, 3), axis=0)
+colors = np.unique(I.reshape(-1, 3), axis=0)
 n = len(colors)
 print(n)
 ```

source/exercises100.ktx

@@ -863,9 +863,9 @@ hint: np.unique
 < a66
 # Author: Fisher Wang
 
-w, h = 16, 16
+w, h = 256, 256
-img = np.random.randint(0, 256, (w, h, 3)).astype(np.ubyte)
+I = np.random.randint(0, 4, (w, h, 3)).astype(np.ubyte)
-colors = np.unique(img.reshape(-1, 3), axis=0)
+colors = np.unique(I.reshape(-1, 3), axis=0)
 n = len(colors)
 print(n)