Update app.py

Fix 16:9 issue (divided by 16 pipeline assertion), Update widget name for clarification for reso grid.

app.py

@@ -56,8 +56,8 @@ RES_CHOICES = {
         "1104x1472 ( 3:4 )",
         "1536x1024 ( 3:2 )",
         "1024x1536 ( 2:3 )",
-        "1600x900 ( 16:9 )",
-        "900x1600 ( 9:16 )",
+        "1600x896 ( 16:9 )",
+        "896x1600 ( 9:16 )", # not 900 coz divided by 16 needed
         "1680x720 ( 21:9 )",
         "720x1680 ( 9:21 )",
     ],
@@ -435,7 +435,7 @@ with gr.Blocks(title="Z-Image Demo") as demo:
                 res_cat = gr.Dropdown(value=1024, choices=choices, label="Resolution Category")
 
                 initial_res_choices = RES_CHOICES["1024"]
-                resolution = gr.Dropdown(value=initial_res_choices[0], choices=initial_res_choices, label="Resolution")
+                resolution = gr.Dropdown(value=initial_res_choices[0], choices=initial_res_choices, label="Width x Height (Ratio)")
 
             with gr.Row():
                 seed = gr.Number(label="Seed", value=-1, precision=0)