Photoshop Levels Help please

[Owmuchonomy]

I am trying to work on my image files with the levels feature.  I can get levels open in RGB combined or each of the individual colour channels.  However what I am trying to do is assess my image levels with all the separate colour channels open at the same time (not just one colour at a time).  How can i do this?

Here you can see the red channel open but i want red, green and blue open at the same time so I can align the histograms.

[Psychobilly]

I kn ow it's not exactly what your after but you can have the separate channels displayed at the same time in the Histogram Window...

So you would be working on the levels slider but monitoring the effect in the histogram window...

Peter..

[msh1]

bring up histogram first then levels

mark