Adjust ControlNet parameters and update default prompts for improved generation quality

app.py

@@ -78,7 +78,7 @@ def generate(
         control_image=control_image,
         controlnet_conditioning_scale=float(controlnet_scale),
         control_guidance_start=0.0,
-        control_guidance_end=0.85,
+        control_guidance_end=0.65,
         num_inference_steps=int(num_steps),
         guidance_scale=float(guidance_scale),
         height=768,
@@ -95,12 +95,13 @@ DEFAULT_PROMPT = (
     "oversized t-shirt, baggy pants, chunky round shoes, "
     "bold clean ink outlines, apricot warm glowing skin tone, "
     "rosy cheeks, large expressive eyes, soft pastel colors, "
+    "2d hand-drawn, cel animation, flat colors, "
     "Ponyo 2008 Miyazaki character design sheet, white background, "
     "three views front side portrait"
 )
 DEFAULT_NEG = (
     "blurry, dark skin, umber brown, muddy colors, soft edges, "
-    "no outlines, photorealistic, 3d render, ugly, deformed, "
+    "no outlines, photorealistic, 3d render, CG, chibi, ugly, deformed, "
     "extra limbs, watermark, signature"
 )
 
@@ -256,7 +257,7 @@ with gr.Blocks(title="Ghibli Character Studio") as demo:
             with gr.Accordion("⚙️  Advanced Controls", open=False):
                 with gr.Row():
                     controlnet_scale = gr.Slider(
-                        0.3, 1.0, value=0.7, step=0.05,
+                        0.3, 1.0, value=0.55, step=0.05,
                         label="ControlNet Strength",
                         info="Higher = follows your sketch more strictly"
                     )
@@ -276,7 +277,7 @@ with gr.Blocks(title="Ghibli Character Studio") as demo:
                         info="Change for variation"
                     )
                 with gr.Row():
-                    canny_low  = gr.Slider(50,  150, value=100, step=5,  label="Canny Low Threshold")
+                    canny_low  = gr.Slider(50,  150, value=120, step=5,  label="Canny Low Threshold")
                     canny_high = gr.Slider(100, 300, value=200, step=10, label="Canny High Threshold")
 
             generate_btn = gr.Button("✨  Generate Ponyo Style", variant="primary", size="lg")
@@ -298,7 +299,7 @@ with gr.Blocks(title="Ghibli Character Studio") as demo:
     # ── Tips ───────────────────────────────────────────────────────────────────
     with gr.Accordion("💡  Tips for best results", open=False):
         gr.Markdown("""
-        - **ControlNet Strength 0.6–0.75** gives the best balance between your character's shape and Ghibli style
+        - **ControlNet Strength 0.45–0.6** gives the best balance between your character's shape and Ghibli style
         - **Canny thresholds** — if the edge map looks too noisy, raise the low threshold. If too sparse, lower it.
         - **Seed** — lock a seed you like, then only change the prompt to iterate consistently
         - For a **character sheet with 3 views**, make sure your image shows front + side + face clearly before uploading