Update app.py

app.py

@@ -106,15 +106,16 @@ def get_ai_video(pil_image, prompt, style, cb=None):
 # ── Color Grading ─────────────────────────────────────────────────
 def color_grade(frame, style):
     f = frame.astype(np.float32)/255.
-    f = f + 0.20*f*(1-f)*(2*f-1)*(-1)               # S-curve
+    # Gentle S-curve — lift mids slightly, don't crush blacks
+    f = np.clip(f + 0.08*f*(1-f)*(2*f-1)*(-1), 0, 1)
     if style=="premium":
         lum=0.299*f[:,:,0]+0.587*f[:,:,1]+0.114*f[:,:,2]
         sh=np.clip(1.-lum*2.5,0,1)[:,:,None]
         hi=np.clip((lum-.6)*2.5,0,1)[:,:,None]
-        f[:,:,0]+=(-0.04*sh[:,:,0]+0.05*hi[:,:,0])
-        f[:,:,1]+=(0.03*sh[:,:,0]+0.02*hi[:,:,0])
-        f[:,:,2]+=(0.05*sh[:,:,0]-0.04*hi[:,:,0])
-        f*=1.04
+        f[:,:,0]+=(-0.02*sh[:,:,0]+0.03*hi[:,:,0])
+        f[:,:,1]+=(0.01*sh[:,:,0]+0.01*hi[:,:,0])
+        f[:,:,2]+=(0.03*sh[:,:,0]-0.02*hi[:,:,0])
+        f=np.clip(f*1.03, 0, 1)
     elif style=="energetic":
         gray=0.299*f[:,:,0:1]+0.587*f[:,:,1:2]+0.114*f[:,:,2:3]
         f=np.clip(gray+1.5*(f-gray),0,1); f=np.clip(f*1.12-.02,0,1)
@@ -127,10 +128,10 @@ def color_grade(frame, style):
     return np.clip(f*255,0,255).astype(np.uint8)
 
 # ── Vignette ──────────────────────────────────────────────────────
-def vignette(frame, strength=0.65):
+def vignette(frame, strength=0.40):
     h,w=frame.shape[:2]; Y,X=np.ogrid[:h,:w]
-    dist=np.sqrt(((X-w/2)/(w/2*.85))**2+((Y-h/2)/(h/2))**2)
-    mask=np.clip(1.-strength*dist**2.,0,1)
+    dist=np.sqrt(((X-w/2)/(w/2*.90))**2+((Y-h/2)/(h/2))**2)
+    mask=np.clip(1.-strength*dist**1.8,0,1)
     return np.clip(frame.astype(np.float32)*mask[:,:,None],0,255).astype(np.uint8)
 
 # ── 3D Perspective Warp ────────────────────────────────────────────
@@ -403,9 +404,9 @@ def render_cinematic(
     img=ImageEnhance.Color(img).enhance(1.15)
     base=np.array(img.resize((BW,BH),Image.LANCZOS))
 
-    # Pre-build vignette
+    # Pre-build vignette — gentle, not crushing blacks
     Y,X=np.ogrid[:TH,:TW]
-    vmask=np.clip(1.-0.65*(np.sqrt(((X-TW/2)/(TW/2*.85))**2+((Y-TH/2)/(TH/2))**2)**2.),0,1).astype(np.float32)
+    vmask=np.clip(1.-0.40*(np.sqrt(((X-TW/2)/(TW/2*.90))**2+((Y-TH/2)/(TH/2))**2)**1.8),0,1).astype(np.float32)
 
     # Bokeh system
     bokeh=BokehSystem(TW,TH,n=22,style=style) if add_bokeh else None
@@ -463,10 +464,10 @@ def render_cinematic(
 
         frame=cv2.resize(base[y1:y2,x1:x2],(TW,TH),interpolation=cv2.INTER_LINEAR)
 
-        # 3D perspective warp
+        # 3D perspective warp — gentle angles only
         ry,rx=get_3d_angles(tg)
-        if abs(ry)>0.3: frame=warp_3d(frame,ry,"y")
-        if abs(rx)>0.2: frame=warp_3d(frame,rx,"x")
+        if abs(ry)>0.3: frame=warp_3d(frame,ry*0.5,"y")
+        if abs(rx)>0.2: frame=warp_3d(frame,rx*0.5,"x")
 
         # Color grade
         frame=color_grade(frame,style)
@@ -486,9 +487,9 @@ def render_cinematic(
         # Cinematic bars
         if add_bars: frame[:44,:]=0; frame[-44:,:]=0
 
-        # Fade
-        if tg<0.05: alpha=ease_out_expo(tg/0.05)
-        elif tg>0.92: alpha=ease_in_out((1.-tg)/0.08)
+        # Fade — very quick fade in (first 3%), slow fade out
+        if tg<0.03: alpha=ease_out_expo(tg/0.03)
+        elif tg>0.93: alpha=ease_in_out((1.-tg)/0.07)
         else: alpha=1.
         if alpha<1.: frame=np.clip(frame.astype(np.float32)*alpha,0,255).astype(np.uint8)