Update main.py

main.py

@@ -80,26 +80,20 @@ def compute_deltaE_00(lin_src, lin_ref):
 
 def apply_color_pipeline(target_bgr, ref24, tgt24):
     tgt_lin = to_linear_srgb(target_bgr)
+    
+    # 1. White Balance (Von Kries scaling)
     gains = np.median(ref24[18:24], axis=0) / np.maximum(np.median(tgt24[18:24], axis=0), 1e-6)
     tgt_lin_wb = tgt_lin * gains.reshape(1, 1, 3)
     tgt24_wb = tgt24 * gains
 
-    def objective(W_flat):
-        W = W_flat.reshape(3, 3)
-        pred_lin = np.clip(tgt24_wb @ W, 0, 1)
-        return np.mean(compute_deltaE_00(pred_lin, ref24))
-        
+    # 2. INSTANT 3x3 Matrix Solver (Ridge Regression)
+    # The 0.01 alpha prevents extreme matrix values so colors never explode or warp
     X, Y = tgt24_wb, ref24
-    W_init = np.linalg.inv(X.T @ X + 0.05 * np.eye(3)) @ X.T @ Y
-    res = minimize(
-        objective,
-        W_init.flatten(),
-        method='Powell',
-        options={"maxiter": 150, "xtol": 1e-4, "ftol": 1e-4},
-    )
-    W_opt = res.x.reshape(3, 3)
+    W_opt = np.linalg.inv(X.T @ X + 0.01 * np.eye(3)) @ X.T @ Y
 
+    # 3. Apply to full image
     corrected_lin = (tgt_lin_wb.reshape(-1, 3) @ W_opt).reshape(tgt_lin_wb.shape)
+    
     return to_srgb_u8(np.clip(corrected_lin, 0, 1))
 
 # ==============================================================================