fix cuda check

enhanced_app.py

@@ -52,6 +52,9 @@ try:
 except ImportError:
     print("DepthAnythingV2 not available. Using precomputed examples only.")
     DEPTH_AVAILABLE = False
+    
+    
+CUDA_AVAILABLE = torch.cuda.is_available() 
 
 # Set environment variable to disable xFormers
 os.environ['XFORMERS_DISABLED'] = '1'
@@ -591,7 +594,7 @@ class PrecomputedExamplesManager:
         """Create a preview thumbnail from RGB input image."""
         try:
             image = Image.open(rgb_path)
-            image.thumbnail((200, 150), Image.Resampling.LANCZOS)
+            image.thumbnail((600, 450), Image.Resampling.LANCZOS)
             return image
                 
         except Exception as e:
@@ -898,7 +901,7 @@ def create_gradio_interface():
         with gr.Row():
             # Left Column: Controls and Input
             with gr.Column(scale=1):
-                if DEPTH_AVAILABLE:
+                if CUDA_AVAILABLE:
                     gr.Markdown("### Upload Image")
                     
                     uploaded_image = gr.Image(
@@ -946,7 +949,7 @@ def create_gradio_interface():
                 gr.Markdown("#### 3D Point Cloud")
                 pointcloud_output = gr.Plot(label="Interactive 3D Point Cloud (Colored by Segmentation)")
         
-        if DEPTH_AVAILABLE:
+        if CUDA_AVAILABLE:
           upload_btn.click(
               fn=process_uploaded_image,
               inputs=[uploaded_image],