Fixed some comments and types.

NTwain/Triplets/DGImage/DGImage.CieColor.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.CieColor"/>.
+    /// </summary>
 	public sealed class CieColor : OpBase
 	{
 		internal CieColor(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.ExtImageInfo.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.ExtImageInfo"/>.
+    /// </summary>
 	public sealed class ExtImageInfo : OpBase
 	{
 		internal ExtImageInfo(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.Filter.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.Filter"/>.
+    /// </summary>
 	public sealed class Filter : OpBase
 	{
         internal Filter(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.GrayResponse.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.GrayResponse"/>.
+    /// </summary>
 	public sealed class GrayResponse : OpBase
 	{
 		internal GrayResponse(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.IccProfile.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.IccProfile"/>.
+    /// </summary>
 	public sealed class IccProfile : OpBase
 	{
 		internal IccProfile(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.ImageFileXfer.cs

@@ -4,6 +4,9 @@ using NTwain.Values;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.ImageFileXfer"/>.
+    /// </summary>
 	sealed class ImageFileXfer : OpBase
 	{
 		internal ImageFileXfer(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.ImageInfo.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.ImageInfo"/>.
+    /// </summary>
 	public sealed class ImageInfo : OpBase
 	{
 		internal ImageInfo(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.ImageLayout.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.ImageLayout"/>.
+    /// </summary>
 	public sealed class ImageLayout : OpBase
 	{
 		internal ImageLayout(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.JpegCompression.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.JpegCompression"/>.
+    /// </summary>
 	public sealed class JpegCompression : OpBase
 	{
 		internal JpegCompression(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.Palette8.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.Palette8"/>.
+    /// </summary>
 	public sealed class Palette8 : OpBase
 	{
 		internal Palette8(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.RgbResponse.cs

@@ -4,6 +4,9 @@ using System;
 
 namespace NTwain.Triplets
 {
+    /// <summary>
+    /// Represents <see cref="DataArgumentType.RgbResponse"/>.
+    /// </summary>
 	public sealed class RgbResponse : OpBase
 	{
 		internal RgbResponse(ITwainSessionInternal session) : base(session) { }

NTwain/Triplets/DGImage/DGImage.cs

@@ -1,8 +1,9 @@
-using System;
+using NTwain.Values;
+using System;
 namespace NTwain.Triplets
 {
-	/// <summary>
-	/// Class for grouping triplet operations under the Image data group.
+    /// <summary>
+    /// Represents <see cref="DataGroups.Image"/>.
 	/// </summary>
 	public sealed class DGImage
 	{