diff --git a/libs/MVS/SceneTexture.cpp b/libs/MVS/SceneTexture.cpp
index aedc304..2e11dd4 100644
--- a/libs/MVS/SceneTexture.cpp
+++ b/libs/MVS/SceneTexture.cpp
@@ -10406,9 +10406,17 @@ void MeshTexture::GlobalSeamLeveling3()
 				if (a == Color::ZERO)
 					continue;
 				Pixel8U& v = image.at<Pixel8U>(r,c);
+				// 替换原来的 RGB2YCBCR → 加减 → YCBCR2RGB 那段
+				const float maxAdjY = 25.0f;
+				const float maxAdjC = 12.0f;
+				Color clamped_a;
+				clamped_a[0] = CLAMP(a[0], -maxAdjY, maxAdjY);
+				clamped_a[1] = CLAMP(a[1], -maxAdjC, maxAdjC);
+				clamped_a[2] = CLAMP(a[2], -maxAdjC, maxAdjC);
+
 				const Color col(RGB2YCBCR(Color(v)));
-				const Color acol(YCBCR2RGB(Color(col+a)));
-				for (int p=0; p<3; ++p)
+				const Color acol(YCBCR2RGB(Color(col + clamped_a)));
+				for (int p = 0; p < 3; ++p)
 					v[p] = (uint8_t)CLAMP(ROUND2INT(acol[p]), 0, 255);
 			}
 		}