diff --git a/src/nvtt/Context.cpp b/src/nvtt/Context.cpp
index 5e3220c..234e232 100644
--- a/src/nvtt/Context.cpp
+++ b/src/nvtt/Context.cpp
@@ -280,6 +280,11 @@ bool Compressor::Private::compress(const InputOptions::Private & inputOptions, c
             // Resize input.
             img.resize(w, h, d, ResizeFilter_Box);
 
+            // Apply color transform.
+            if (inputOptions.colorTransform == ColorTransform_YCoCg) {
+                img.toYCoCg();
+            }
+
             nvtt::Surface tmp = img;
             if (!img.isNormalMap()) {
                 tmp.toGamma(inputOptions.outputGamma);
diff --git a/src/nvtt/InputOptions.cpp b/src/nvtt/InputOptions.cpp
index 8179799..95af5e6 100644
--- a/src/nvtt/InputOptions.cpp
+++ b/src/nvtt/InputOptions.cpp
@@ -104,6 +104,8 @@ void InputOptions::reset()
     m.inputGamma = 2.2f;
     m.outputGamma = 2.2f;
 
+    m.colorTransform = ColorTransform_None;
+
     m.generateMipmaps = true;
     m.maxLevel = -1;
     m.mipmapFilter = MipmapFilter_Box;
@@ -124,7 +126,14 @@ void InputOptions::reset()
 
 
 // Setup the input image.
-void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/, int arraySize /*= 1*/)
+// Overload for ABI compatibility
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth /*= 1*/)
+{
+    setTextureLayout(type, width, height, depth, 1);
+}
+
+// Setup the input image.
+void InputOptions::setTextureLayout(TextureType type, int width, int height, int depth, int arraySize)
 {
     // Validate arguments.
     nvCheck(width >= 0);
@@ -330,6 +339,18 @@ void InputOptions::setNormalizeMipmaps(bool normalize)
     m.normalizeMipmaps = normalize;
 }
 
+// Set color transform.
+void InputOptions::setColorTransform(ColorTransform t)
+{
+    m.colorTransform = t;
+}
+
+// Set linear transform for the given channel.
+// Stub for ABI compatibily, never implemented
+void InputOptions::setLinearTransform(int, float, float, float, float)
+{
+}
+
 void InputOptions::setMaxExtents(int e)
 {
     nvDebugCheck(e > 0);
diff --git a/src/nvtt/InputOptions.h b/src/nvtt/InputOptions.h
index b28c8fb..c8c9073 100644
--- a/src/nvtt/InputOptions.h
+++ b/src/nvtt/InputOptions.h
@@ -55,6 +55,9 @@ namespace nvtt
         float inputGamma;
         float outputGamma;
 
+        // Color transform.
+        ColorTransform colorTransform;
+
         // Mipmap generation options.
         bool generateMipmaps;
         int maxLevel;
diff --git a/src/nvtt/nvtt.h b/src/nvtt/nvtt.h
index 0820092..0909501 100644
--- a/src/nvtt/nvtt.h
+++ b/src/nvtt/nvtt.h
@@ -249,6 +249,17 @@ namespace nvtt
         ResizeFilter_Mitchell,
     };
 
+    // Color transformation.
+    // deprecated since 2.1.0
+    enum ColorTransform
+    {
+        ColorTransform_None,
+        ColorTransform_Linear,
+        ColorTransform_Swizzle,
+        ColorTransform_YCoCg,
+        ColorTransform_ScaledYCoCg,
+    };
+
     // Extents rounding mode.
     enum RoundMode
     {
@@ -290,7 +301,9 @@ namespace nvtt
         NVTT_API void reset();
 
         // Setup input layout.
-        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1, int arraySize = 1);
+        // Overload for ABI compatibility
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d = 1 /*, arraysize = 1 */);
+        NVTT_API void setTextureLayout(TextureType type, int w, int h, int d, int arraySize);
         NVTT_API void resetTextureLayout();
 
         // Set mipmap data. Copies the data.
@@ -320,6 +333,10 @@ namespace nvtt
         NVTT_API void setNormalFilter(float sm, float medium, float big, float large);
         NVTT_API void setNormalizeMipmaps(bool b);
 
+        // Set color transforms.
+        NVTT_API void setColorTransform(ColorTransform t);
+        NVTT_API void setLinearTransform(int channel, float w0, float w1, float w2, float w3);
+
         // Set resizing options.
         NVTT_API void setMaxExtents(int d);
         NVTT_API void setRoundMode(RoundMode mode);