diff --git a/colorm.go b/colorm.go
index 12b8b43a7..f76ba5946 100644
--- a/colorm.go
+++ b/colorm.go
@@ -44,12 +44,12 @@ type ColorM struct {
 	es          [ColorMDim - 1][ColorMDim]float64
 }
 
-func (c ColorM) dim() int {
+func (c *ColorM) dim() int {
 	return ColorMDim
 }
 
 // Element returns a value of a matrix at (i, j).
-func (c ColorM) Element(i, j int) float64 {
+func (c *ColorM) Element(i, j int) float64 {
 	if !c.initialized {
 		if i == j {
 			return 1
diff --git a/geom.go b/geom.go
index 84e721445..f97fa3415 100644
--- a/geom.go
+++ b/geom.go
@@ -37,12 +37,12 @@ type GeoM struct {
 	es          [GeoMDim - 1][GeoMDim]float64
 }
 
-func (g GeoM) dim() int {
+func (g *GeoM) dim() int {
 	return GeoMDim
 }
 
 // Element returns a value of a matrix at (i, j).
-func (g GeoM) Element(i, j int) float64 {
+func (g *GeoM) Element(i, j int) float64 {
 	if !g.initialized {
 		if i == j {
 			return 1
diff --git a/image.go b/image.go
index ac6086b35..dc04c1441 100644
--- a/image.go
+++ b/image.go
@@ -67,7 +67,7 @@ func (i *innerImage) drawImage(c *opengl.Context, img *innerImage, options *Draw
 	clr := options.ColorM
 	w, h := img.size()
 	quads := &textureQuads{parts, w, h}
-	return i.framebuffer.DrawTexture(c, img.texture, quads, geo, clr)
+	return i.framebuffer.DrawTexture(c, img.texture, quads, &geo, &clr)
 }
 
 func u(x float64, width int) float32 {