diff --git a/BPTCEncoder/include/BC7Compressor.h b/BPTCEncoder/include/BC7Compressor.h
index 22eb2ce..b05b574 100755
--- a/BPTCEncoder/include/BC7Compressor.h
+++ b/BPTCEncoder/include/BC7Compressor.h
@@ -50,12 +50,12 @@ namespace BC7C
 
 	// Compress the image given as RGBA data to BC7 format. Width and Height are the dimensions of
 	// the image in pixels.
-	void CompressImageBC7(const unsigned char *inBuf, unsigned char *outBuf, int width, int height);
+	void CompressImageBC7(const unsigned char *inBuf, unsigned char *outBuf, unsigned int width, unsigned int height);
 
 	// Compress the image given as RGBA data to BC7 format using an algorithm optimized for SIMD
 	// enabled platforms. Width and Height are the dimensions of the image in pixels.
-	void CompressImageBC7SIMD(const unsigned char* inBuf, unsigned char* outBuf, int width, int height);
+	void CompressImageBC7SIMD(const unsigned char* inBuf, unsigned char* outBuf, unsigned int width, unsigned int height);
 
 	// Decompress the image given as BC7 data to R8G8B8A8 format. Width and Height are the dimensions of the image in pixels.
-	void DecompressImageBC7SIMD(const unsigned char* inBuf, unsigned char* outBuf, int width, int height);
+	void DecompressImageBC7SIMD(const unsigned char* inBuf, unsigned char* outBuf, unsigned int width, unsigned int height);
 }
diff --git a/BPTCEncoder/src/BC7Compressor.cpp b/BPTCEncoder/src/BC7Compressor.cpp
index cfd7c8b..32ec122 100755
--- a/BPTCEncoder/src/BC7Compressor.cpp
+++ b/BPTCEncoder/src/BC7Compressor.cpp
@@ -1392,13 +1392,13 @@ namespace BC7C
 	// 4-byte RGBA format. The width and height parameters specify the size of the image in pixels.
 	// The buffer pointed to by outBuf should be large enough to store the compressed image. This
 	// implementation has an 4:1 compression ratio.
-	void CompressImageBC7(const uint8* inBuf, uint8* outBuf, int width, int height)
+	void CompressImageBC7(const unsigned char *inBuf, unsigned char *outBuf, unsigned int width, unsigned int height)
 	{
 		uint32 block[16];
 		BC7CompressionMode::ResetNumUses();
 		BC7CompressionMode::MaxAnnealingIterations = min(BC7CompressionMode::kMaxAnnealingIterations, GetQualityLevel());
 
-		for(int j = 0; j < height; j += 4, inBuf += width * 4 * 4)
+		for(int j = 0; j < height; j += 4)
 		{
 			for(int i = 0; i < width; i += 4)
 			{
diff --git a/BPTCEncoder/src/BC7CompressorSIMD.cpp b/BPTCEncoder/src/BC7CompressorSIMD.cpp
index f357900..c84784c 100755
--- a/BPTCEncoder/src/BC7CompressorSIMD.cpp
+++ b/BPTCEncoder/src/BC7CompressorSIMD.cpp
@@ -978,7 +978,7 @@ namespace BC7C
 	// 4-byte RGBA format. The width and height parameters specify the size of the image in pixels.
 	// The buffer pointed to by outBuf should be large enough to store the compressed image. This
 	// implementation has an 4:1 compression ratio.
-	void CompressImageBC7SIMD(const uint8* inBuf, uint8* outBuf, int width, int height)
+	void CompressImageBC7SIMD(const unsigned char *inBuf, unsigned char *outBuf, unsigned int width, unsigned int height)
 	{
 		ALIGN_SSE uint32 block[16];
 
@@ -987,7 +987,7 @@ namespace BC7C
 
 		BC7CompressionModeSIMD::MaxAnnealingIterations = GetQualityLevel();
 
-		for(int j = 0; j < height; j += 4, inBuf += width * 4 * 4)
+		for(int j = 0; j < height; j += 4)
 		{
 			for(int i = 0; i < width; i += 4)
 			{