diff -up libpgf/include/PGFimage.h.r147 libpgf/include/PGFimage.h
--- libpgf/include/PGFimage.h.r147	2015-08-10 10:24:28.319204436 -0500
+++ libpgf/include/PGFimage.h	2015-08-10 10:44:12.588655556 -0500
@@ -538,7 +538,7 @@ private:
 	ProgressMode m_progressMode;	///< progress mode used in Read and Write; PM_Relative is default mode
 
 	void ComputeLevels();
-	void CompleteHeader();
+	bool CompleteHeader();
 	void RgbToYuv(int pitch, UINT8* rgbBuff, BYTE bpp, int channelMap[], CallbackPtr cb, void *data) THROW_;
 	void Downsample(int nChannel);
 	UINT32 UpdatePostHeaderSize() THROW_;
diff -up libpgf/src/Decoder.cpp.r147 libpgf/src/Decoder.cpp
--- libpgf/src/Decoder.cpp.r147	2015-08-10 10:24:28.637208326 -0500
+++ libpgf/src/Decoder.cpp	2015-08-10 10:45:04.349979345 -0500
@@ -158,7 +158,7 @@ CDecoder::CDecoder(CPGFStream* stream, P
 		if (size > 0) {
 			// read post-header
 			if (header.mode == ImageModeIndexedColor) {
-				ASSERT((size_t)size >= ColorTableSize);
+				if (size < ColorTableSize) ReturnWithError(FormatCannotRead);
 				// read color table
 				count = expected = ColorTableSize;
 				m_stream->Read(&count, postHeader.clut);
diff -up libpgf/src/PGFimage.cpp.r147 libpgf/src/PGFimage.cpp
--- libpgf/src/PGFimage.cpp.r147	2014-03-21 07:09:10.000000000 -0500
+++ libpgf/src/PGFimage.cpp	2015-08-10 10:45:33.371423512 -0500
@@ -145,7 +145,7 @@ void CPGFImage::Open(CPGFStream *stream)
 	m_height[0] = m_header.height;
 
 	// complete header
-	CompleteHeader();
+	if (!CompleteHeader()) ReturnWithError(FormatCannotRead);
 
 	// interpret quant parameter
 	if (m_header.quality > DownsampleThreshold && 
@@ -205,7 +205,7 @@ void CPGFImage::Open(CPGFStream *stream)
 }
 
 ////////////////////////////////////////////////////////////
-void CPGFImage::CompleteHeader() {
+bool CPGFImage::CompleteHeader() {
 	if (m_header.mode == ImageModeUnknown) {
 		// undefined mode
 		switch(m_header.bpp) {
@@ -261,20 +261,20 @@ void CPGFImage::CompleteHeader() {
 		// change mode
 		m_header.mode = ImageModeRGBA;
 	}
-	ASSERT(m_header.mode != ImageModeBitmap || m_header.bpp == 1);
-	ASSERT(m_header.mode != ImageModeIndexedColor || m_header.bpp == 8);
-	ASSERT(m_header.mode != ImageModeGrayScale || m_header.bpp == 8);
-	ASSERT(m_header.mode != ImageModeGray16 || m_header.bpp == 16);
-	ASSERT(m_header.mode != ImageModeGray32 || m_header.bpp == 32);
-	ASSERT(m_header.mode != ImageModeRGBColor || m_header.bpp == 24);
-	ASSERT(m_header.mode != ImageModeRGBA || m_header.bpp == 32);
-	ASSERT(m_header.mode != ImageModeRGB12 || m_header.bpp == 12);
-	ASSERT(m_header.mode != ImageModeRGB16 || m_header.bpp == 16);
-	ASSERT(m_header.mode != ImageModeRGB48 || m_header.bpp == 48);
-	ASSERT(m_header.mode != ImageModeLabColor || m_header.bpp == 24);
-	ASSERT(m_header.mode != ImageModeLab48 || m_header.bpp == 48);
-	ASSERT(m_header.mode != ImageModeCMYKColor || m_header.bpp == 32);
-	ASSERT(m_header.mode != ImageModeCMYK64 || m_header.bpp == 64);
+	if (m_header.mode == ImageModeBitmap && m_header.bpp != 1) return false;
+	if (m_header.mode == ImageModeIndexedColor && m_header.bpp != 8) return false;
+	if (m_header.mode == ImageModeGrayScale && m_header.bpp != 8) return false;
+	if (m_header.mode == ImageModeGray16 && m_header.bpp != 16) return false;
+	if (m_header.mode == ImageModeGray32 && m_header.bpp != 32) return false;
+	if (m_header.mode == ImageModeRGBColor && m_header.bpp != 24) return false;
+	if (m_header.mode == ImageModeRGBA && m_header.bpp != 32) return false;
+	if (m_header.mode == ImageModeRGB12 && m_header.bpp != 12) return false;
+	if (m_header.mode == ImageModeRGB16 && m_header.bpp != 16) return false;
+	if (m_header.mode == ImageModeRGB48 && m_header.bpp != 48) return false;
+	if (m_header.mode == ImageModeLabColor && m_header.bpp != 24) return false;
+	if (m_header.mode == ImageModeLab48 && m_header.bpp != 48) return false;
+	if (m_header.mode == ImageModeCMYKColor && m_header.bpp != 32) return false;
+	if (m_header.mode == ImageModeCMYK64 && m_header.bpp != 64) return false;
 
 	// set number of channels
 	if (!m_header.channels) {
@@ -300,8 +300,7 @@ void CPGFImage::CompleteHeader() {
 			m_header.channels = 4;
 			break;
 		default:
-			ASSERT(false);
-			m_header.channels = 3;
+			return false;
 		}
 	}
 
@@ -311,6 +310,8 @@ void CPGFImage::CompleteHeader() {
 	if (!m_header.usedBitsPerChannel || m_header.usedBitsPerChannel > bpc) {
 		m_header.usedBitsPerChannel = bpc;
 	}
+
+	return true;
 }
 
 //////////////////////////////////////////////////////////////////////