In order to use the processing pages you need to click on the yellow bar on the top of the page, chose "Allow Blocked Content" and then click yes in the following dialog window.

By placing the cursor over the text in the upper left column, you can follow the processing steps and how it affects the image.

 

RGB image

Blend in RGB+Ha as lighten

Blend in Ha as luminosity

Noise Ninja

Colour balance

Colour balance non-nebula

Unsharp mask

Enhance star colours

 

Processing

RGB

RGB+Ha

Ha

Combined

Invert mask