diff --git a/MagickCore/channel.c b/MagickCore/channel.c
index dd236d7..71acfa5 100644
--- a/MagickCore/channel.c
+++ b/MagickCore/channel.c
@@ -69,16 +69,20 @@
% red, 1), separated by actions as follows:
%
% <=> exchange two channels (e.g. red<=>blue)
-% => transfer a channel to another (e.g. red=>green)
-% = assign a constant (e.g. red=50%)
-% , separate channel operations (e.g. red, green)
-% | read channels from next input image (e.g. red | green)
-% ; write channels to next output image (e.g. red; green; blue)
+% => copy one channel to another channel (e.g. red=>green)
+% = assign a constant value to a channel (e.g. red=50%)
+% , write new image channels in the specified order (e.g. red, green)
+% | extract channels from next image in the sequence (e.g.
+% green=>red|red=>green).
+% ; separate each specified channel to its own image (e.g.
+% red; green; blue)
%
-% A channel without a operation symbol implies extract. For example, to create
-% 3 grayscale images from the red, green, and blue channels of an image, use:
+% For example, to create 3 grayscale images from the red, green, and blue
+% channels of an image, use:
%
-% -channel-fx "red; green; blue"
+% -channel-fx "red; green; blue"
+%
+% A channel without an operation symbol implies separate (i.e, semicolon).
%
% The format of the ChannelFxImage method is:
%
@@ -344,8 +348,11 @@
break;
}
case ExtractChannelOp:
+ {
break;
- }
+ destination_channel++;
+ }
+ }
status=ChannelImage(destination_image,destination_channel,channel_op,
source_image,source_channel,ClampToQuantum(pixel),exception);
if (status == MagickFalse)