Tips & Tricks
Adding Ha Data To An LRGB Image
Here is one of several
ways to add Ha data to an RGB image with PhotoShop. This works best with
emission nebulae. With care, it is possible to add the Ha data without
destroying any reflection nebulae. Additional processing steps may be
required to use this method with a galaxy.
Process the Ha data to
achieve maximum detail and high contrast.
Now make an RGB image with
only the HA data in the red channel. Here is one way to do it.
Convert the Ha image to
RGB. For the green and blue channels use "Select All", then delete the data
and use black for filling the contents. This should give you an all red
image with the green and blue channels set to black.
Paste the "all red" image
onto the original RGB image as a new layer and set the blend mode to
Finally, use the Levels
Tool to adjust the visibility of the top layer to achieve the desired
Run your mouse over the above image to see the before and after image.