fixed legend showing

app.py

@@ -22,8 +22,8 @@ if len(uploaded_files) == 3:
         scan_lines.append(scan_line)
 
     plt.figure(figsize=(10, 6))
-    line_styles = ['-', '--', '-.'] 
-    colors = ['b', 'g', 'r']
+    line_styles = ['-.', '--', 'solid'] 
+    colors = ['blue', 'green', 'red']
 
     for i, scan_line in enumerate(scan_lines):
         file_name = uploaded_files[i].name
@@ -35,6 +35,9 @@ if len(uploaded_files) == 3:
     plt.xlabel('Pixel Position')
     plt.ylabel('Pixel Value')
     plt.title('Comparison of Scan Lines Across Images')
-    plt.legend(loc='upper left')
+    
+    handles, labels = plt.gca().get_legend_handles_labels()
+    by_label = dict(zip(labels, handles))
+    plt.legend(by_label.values(), by_label.keys(), loc='upper left')
     st.pyplot(plt)