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Author: mcychan

nQuantCpp/GilbertCurve.cpp

@@ -333,7 +333,7 @@ namespace Peano
 		errorq.clear();
 		weight = m_weight = abs(weight);
 		margin = weight < .0025 ? 12 : weight < .004 ? 8 : 6;
-		sortedByYDiff = m_saliencies && m_nMaxColor >= 128 && (!m_hasAlpha || weight < .18);
+		sortedByYDiff = m_saliencies && m_nMaxColor >= 128 && weight >= .02 && (!m_hasAlpha || weight < .18);
 		beta = m_nMaxColor > 4 ? (float) (.6f - .00625f * m_nMaxColor) : 1;
 		if (m_nMaxColor > 4) {
 			auto boundary = .005 - .0000625 * m_nMaxColor;
@@ -343,8 +343,12 @@ namespace Peano
 		}
 		else
 			beta *= .95f;
+
 		if (m_nMaxColor > 64 || (m_nMaxColor > 4 && weight > .02))
 			beta *= .4f;
+		if (m_nMaxColor > 128 && weight < .02)
+			beta = .2f;
+
 		DITHER_MAX = weight < .015 ? (weight > .0025) ? (BYTE)25 : 16 : 9;
 		auto edge = m_hasAlpha ? 1 : exp(weight) + .25;
 		auto deviation = !m_hasAlpha && weight > .002 ? .25 : 1;

nQuantCpp/PnnLABQuantizer.cpp

@@ -549,7 +549,7 @@ namespace PnnLABQuant
 		if (hasSemiTransparency)
 			weight *= -1;
 
-		if (dither && !hasSemiTransparency && saliencies.empty() && (nMaxColors <= 128 || weight > .99)) {
+		if (dither && !hasSemiTransparency && saliencies.empty() && (nMaxColors <= 256 || weight > .99)) {
 			saliencies.resize(pixels.size());
 			auto saliencyBase = .1f;
 			for (int i = 0; i < pixels.size(); ++i) {