fix: strictly enforce color palette limitation by applying kmeans quantization to final extraction

app.py

@@ -56,6 +56,12 @@ def process_image(input_image_path, color_limit, export_scale):
     # Generate and save extraction with accurate colors
     from pixelfixer.reconstruct import two_stage_pack
     low = two_stage_pack(rgba, int(r["cols"]), int(r["rows"]), k_colors=k_colors)
+    
+    # Strictly enforce color palette if limit is set
+    if k_colors > 0:
+        from pixelfixer.quantize import kmeans_quantize
+        low, _, _ = kmeans_quantize(low, k=k_colors)
+        
     extract_img = Image.fromarray(low)
     
     # Upscale using perfect multiples to maintain aspect ratio and crispness