display value of channel in legend
It would be helpful to display the value of a channel in the legend, as was done in StripTool (I'd suggest not displaying the scaled value, but the actual value of the channel). This way people can read the value even if the channel is scaled. This also helped address the concern Jamie raised in issue #201
As it is, with the data scaled by the channel, users are often unaware of the actual value of a channel.