diff --git a/nQuantCpp/GilbertCurve.cpp b/nQuantCpp/GilbertCurve.cpp
index 8d60d48..b79878d 100644
--- a/nQuantCpp/GilbertCurve.cpp
+++ b/nQuantCpp/GilbertCurve.cpp
@@ -48,7 +48,7 @@ namespace Peano
 	vector<float> m_weights;
 	short* m_lookup;
 	static BYTE DITHER_MAX = 9, ditherMax;
-	static int margin, thresold;
+	static int thresold;
 	static const float BLOCK_SIZE = 343.0f;
 
 	template <typename T> int sign(T val) {
@@ -125,7 +125,7 @@ namespace Peano
 				m_lookup[offset] = m_ditherFn(m_pPalette, c2.GetValue(), bidx) + 1;
 			m_qPixels[bidx] = m_lookup[offset] - 1;
 
-			if (m_saliencies != nullptr && CIELABConvertor::Y_Diff(pixel, c2) > margin) {
+			if (m_saliencies != nullptr && CIELABConvertor::Y_Diff(pixel, c2) > m_pPalette->Count - 7) {
 				auto strength = 1 / 3.0f;
 				c2 = BlueNoise::diffuse(pixel, m_pPalette->Entries[m_qPixels[bidx]], 1.0f / m_saliencies[bidx], strength, x, y);
 				m_qPixels[bidx] = m_ditherFn(m_pPalette, c2.GetValue(), bidx);
@@ -244,7 +244,6 @@ namespace Peano
 			ditherMax = (BYTE)sqr(5 + edge);
 		else if (pPalette->Count / weight < 3200 && pPalette->Count > 16 && pPalette->Count < 256)
 			ditherMax = (BYTE)sqr(5 + edge);
-		margin = (int) sqr(log2(pPalette->Count) - 1);
 		thresold = DITHER_MAX > 9 ? -112 : -64;
 		auto pLookup = make_unique<short[]>(USHRT_MAX + 1);
 		m_lookup = pLookup.get();