From 87157b5c821e05da274abefc48953492140479f8 Mon Sep 17 00:00:00 2001
From: Mike Wey
Date: Tue, 27 Sep 2011 22:52:34 +0200
Subject: Add Image.separate

---
 dmagick/Array.d |  4 +++-
 dmagick/Image.d | 25 ++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/dmagick/Array.d b/dmagick/Array.d
index 52f5f9f..6dacdc5 100644
--- a/dmagick/Array.d
+++ b/dmagick/Array.d
@@ -231,13 +231,15 @@ Image mergeLayers(Image[] layers, ImageLayerMethod method = ImageLayerMethod.Fla
  * 
  * To add labels to the tiles, assign a "Label" property to each image.
  */
-Image montage(Image[] images, Montage montageInfo)
+Image[] montage(Image[] images, Montage montageInfo)
 {
 	linkImages(images);
 	scope(exit) unlinkImages(images);
 
 	MagickCoreImage* image =
 		MontageImages(images[0].imageRef, montageInfo.montageInfoRef, DMagickExceptionInfo());
+
+	return imageListToArray(image);
 }
 
 /**
diff --git a/dmagick/Image.d b/dmagick/Image.d
index 9b565ce..f2012f3 100644
--- a/dmagick/Image.d
+++ b/dmagick/Image.d
@@ -2455,7 +2455,30 @@ class Image
 		imageRef = ImageRef(image);
 	}
 
-	//TODO: implement separate, returns a range of images.
+	/**
+	 * Constructs a grayscale image for each channel specified.
+	 */
+	Image[] separate(ChannelType channel = ChannelType.DefaultChannels)
+	{
+		Image[] images;
+
+		if ( channel & ChannelType.RedChannel != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.RedChannel) );
+		else if ( channel & ChannelType.GreenChannel != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.GreenChannel) );
+		else if ( channel & ChannelType.BlueChannel != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.BlueChannel) );
+		else if ( channel & ChannelType.OpacityChannel != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.OpacityChannel) );
+		else if ( channel & ChannelType.TrueAlphaChannel != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.TrueAlphaChannel) );
+		else if ( channel & ChannelType.GrayChannels != 0 )
+			images ~= new Image( SeparateImageChannel(imageRef, ChannelType.GrayChannels) );
+
+		DMagickException.throwException(&(imageRef.exception));
+
+		return images;
+	}
 
 	/**
 	 * applies a special effect to the image, similar to the effect achieved
-- 
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