diff --git a/webp/rgb_image.go b/webp/rgb_image.go
index 5632f70..430ad72 100644
--- a/webp/rgb_image.go
+++ b/webp/rgb_image.go
@@ -25,7 +25,7 @@ func NewRGBImage(r image.Rectangle) *RGBImage {
 
 // ColorModel returns RGB color model.
 func (p *RGBImage) ColorModel() color.Model {
-	return ColorModel
+	return RGBModel
 }
 
 // Bounds implements image.Image.At
@@ -48,7 +48,7 @@ func (p *RGBImage) RGBAAt(x, y int) color.RGBA {
 }
 
 // ColorModel is RGB color model instance
-var ColorModel = color.ModelFunc(rgbModel)
+var RGBModel = color.ModelFunc(rgbModel)
 
 func rgbModel(c color.Color) color.Color {
 	if _, ok := c.(RGB); ok {
diff --git a/webp/webp_test.go b/webp/webp_test.go
index 679e825..103c0ce 100644
--- a/webp/webp_test.go
+++ b/webp/webp_test.go
@@ -226,7 +226,7 @@ func TestImageInterface(t *testing.T) {
 	rect := image.Rect(0, 0, 100, 100)
 	img := webp.NewRGBImage(rect)
 
-	if got := img.ColorModel(); got != webp.ColorModel {
+	if got := img.ColorModel(); got != webp.RGBModel {
 		t.Errorf("ColorModel() should return rgb.ColorModel, got: %v", got)
 	}
 
@@ -248,14 +248,14 @@ func TestImageInterface(t *testing.T) {
 func TestConvertFromRGBA(t *testing.T) {
 	rgba := color.RGBA{0x11, 0x22, 0x33, 0xFF}
 	expect := webp.RGB{0x11, 0x22, 0x33}
-	if got := webp.ColorModel.Convert(rgba); got != expect {
+	if got := webp.RGBModel.Convert(rgba); got != expect {
 		t.Errorf("got: %v, expect: %v", got, expect)
 	}
 }
 
 func TestConvertFromRGB(t *testing.T) {
 	c := webp.RGB{0x11, 0x22, 0x33}
-	if got := webp.ColorModel.Convert(c); got != c {
+	if got := webp.RGBModel.Convert(c); got != c {
 		t.Errorf("got: %v, expect: %v", got, c)
 	}
 }