spero di fare cosa gradita.
In giro per forum ho trovato questa procedura niente male per montare insieme una immagine HaGB. Ve la riporto qui giù....scusate se è in inglese
Here's a method that I have been using in Maxim for a while and it seems to
work:
1. Measure the object of interest (emission neb) in both the Ha and
Red images using the aperture tool. You can also measure the background or
a non-saturated star. Divide the Red value by the Ha to get an estimate of
the factor needed to make them roughly equal.
2. Using pixel math, multiply a COPY of the Ha image by the factor
measured in step 1; this may be a large value anywhere from 200 to 1000%.
3. Using pixel math again, add the Ha COPY and Red using adjustment
factors like 50% for each; this will give you a blend of Ha + R. Save this
file with an appropriate name.
4. Proceed with an RGB or LRGB composite using the blended file for R.
5.
You might also try just substituting the Ha for R in an RGB; Maxim seems to
do a pretty good job of making an HaGB image. You can make several
different versions using different blends of Ha and R (i.e. 50/50, 70/30,
etc.) and then layer them in PS. Here's an image of the Medusa nebula I
made recently using the technique described (Ha/R blended 60/40):
http://www.ruppel.darkhorizons.org/IMAG ... HaLRGB.jpg
Clear skies,
Gregg
Visit my astronomy site:
www.ruppel.darkhorizons.org
