Jack-
ATWT is a neat tool I hadn't used before. I did do HDRWT but it clearly needed some more late-stage sharpening. I'll be playing with that some more as I don't think its quite there yet (plus maybe trying it on some previous images).
Andrea-
Here's an outline of Tony Hallas' HaLRGB method I wrote for someone else:
The method's goals are to get the most out of the Ha as luminosity and also as color support for the luminosity it brings to your LRGB: First you do your best (PI for me) on the Ha, RGB and Lum channels (real 1x1 Lum with long exposure for me). In PS, you then make an "Ha as Red" of the Ha by colorizing etc with a Hue and Saturation adjustment layer and flatten. Then you start the HaLRGB with the RGB as base layer and bring in the Lum on top of it in Lum mode, and immediately darken it with curves to avoid wash out. Next you bring in the Ha in Luminosity mode with opacity ~50%. Then you put on top the "Ha as Red" channel in lighten mode and immediately apply curves to bring up the color support for the Ha contribution largely in the shadows. He sets the curve so the bright region of the RGB is unaffected. It is left showing some of the blue tinge in those regions from the Hbeta that accompanies the Ha. So the Ha is basically contributing in the shadows where there was little or no LRGB. Once that is done, he moves the "Ha as Red" level under the Ha luminosity layer (which deepens the color). Finally, for yet richer color he duplicates the now-topmost Ha Luminosity layer with the duplicate put into soft light blend mode at ~50% opacity. Then with all 5 layers, apply final tweaks to different ones to satisfaction.
I've seen similar procedures elsewhere with different variants of the blending modes and order of the layers, but it is nice to have layers to twiddle all the knobs while you're watching. I understand Juan is working on layers for PI which probably would be the easiest way to do this type of method, assuming they also include these, or similar, blending modes.
-Jeff
