Added SetImageType method

README.md

@@ -1,6 +1,6 @@
 # About
 
-This is a fork of [github.com/quirkey/magick](http://github.com/quirkey/magick) with `Colorspace(...)` support
+This is a fork of [github.com/quirkey/magick](http://github.com/quirkey/magick) with `Colorspace(...)` and `SetImageType(...)` support
 
 # magick
 

magick.go

@@ -201,6 +201,21 @@ const (
 	YPBPR         Colorspace = C.YPbPrColorspace
 )
 
+type ImageType C.ImageType
+
+const (
+	Bilevel              ImageType = C.BilevelType
+	Grayscale            ImageType = C.GrayscaleType
+	GrayscaleMatte       ImageType = C.GrayscaleMatteType
+	Palette              ImageType = C.PaletteType
+	PaletteMatte         ImageType = C.PaletteMatteType
+	TrueColor            ImageType = C.TrueColorType
+	TrueColorMatte       ImageType = C.TrueColorMatteType
+	ColorSeparation      ImageType = C.ColorSeparationType
+	ColorSeparationMatte ImageType = C.ColorSeparationMatteType
+	Optimize             ImageType = C.OptimizeType
+)
+
 func (err *MagickError) Error() string {
 	return "MagickError " + err.Severity + ": " + err.Reason + "- " + err.Description
 }
@@ -351,6 +366,15 @@ func (im *MagickImage) Colorspace(cs Colorspace) (err error) {
 	return
 }
 
+func (im *MagickImage) SetImageType(tp ImageType) (err error) {
+	c_img_type := C.ImageType(tp)
+	ok := C.SetImageType(im.Image, c_img_type)
+	if ok == C.MagickFalse {
+		return &MagickError{"error", "", "could not set image type"}
+	}
+	return
+}
+
 // ParseGeometryToRectangleInfo converts from a geometry string (WxH+X+Y) into a Magick
 // RectangleInfo that contains the individual properties
 func (im *MagickImage) ParseGeometryToRectangleInfo(geometry string) (info C.RectangleInfo, err error) {

magick_test.go

@@ -248,6 +248,18 @@ func TestColorspace(t *testing.T) {
 	assert.T(t, err == nil)
 }
 
+func TestSetImageType(t *testing.T) {
+	image := setupImage(t)
+	err := image.SetImageType(TrueColor)
+	assert.T(t, err == nil)
+	err = image.SetImageType(Grayscale)
+	assert.T(t, err == nil)
+	err = image.SetImageType(TrueColorMatte)
+	assert.T(t, err == nil)
+	err = image.SetImageType(GrayscaleMatte)
+	assert.T(t, err == nil)
+}
+
 func TestFullStack(t *testing.T) {
 	var err error
 	var filename string