Take in consideration that you must select a preview of the background in the RGB but you must take care of Ha, so do not select a preview where the final image has Ha. If this fail, uncheck color calibration and calibrate manually.
Juan, I would like to see some results whit this script, and find a method to dim red channel where B and G channles have strong signal.
Take in consideration that you must select a preview of the background in the RGB but you must take care of Ha, so do not select a preview where the final image has Ha.
Did this script get lost in the mist
Has this script been released through the update process yet? I don't see it.I think it has not.
Dave
#feature-id Utilities > HaRGBCombination
#feature-info Script to combine Ha with RGB \
by Silvercup \
see http://pixinsight.com/forum/index.php?topic=3446.0
#feature-icon HaRGBCombination.xpm
* The window is large and doesn't fit comfortably on my 1440x900 display. It seems that a lot of the script's window is taken up by the preview at the top. But the preview seems redundant since there's a separate preview window in the main PI workspace that exactly mimics what you're seeing in the script's preview window.
* One comment, though, is that it's not immediately clear that "show HaRGB" is actually the button that does all the work. For me, usually it's clicking "OK" that sets the script off doing the work, and "show HaRGB" could be misinterpretted as just showing a preview. Perhaps there should be a "generate HaRGB" button just above those, the have 3 toggle RGB/Ha/HaRGB buttons?
* I'm not sure of the workings behind the colour calibration part, but I just had the script hang when using it. I had specified a background preview from my Ha image and white balance preview from the RGB image. If I copied the bg preview from the Ha image to the RGB image and called it up from there, the script did finish and work fine. Probably my fault, just letting you know.
* When choosing the views/images to use for Ha source, RGB source, and the colour calibration previews, the list is also filled with automatically generated views from the script itself. I can't envisage that they'd ever actually be used for those selections, and they clutter up the drop down box adding confusion to the selection. Perhaps views that the script itself generates could be removed/hidden from the drop down?
Wouldn't the math be same?
OK, since you liked the new layout, I took some time from my lunch break and found the issue with STF on Ha, cross this bug out.
BTW, how about 4 buttons: "Show Ha Emission", "Show Ha Continuum", "Show RGB", "Show HaRGB" ? When I was using PixelMath for the same process, the image that was giving me better indication that I had the parameters correct was the C(ontinuum) one, not the Ha emission, what do you think?
And if yes, HaContinuum = HaOriginal - HaEmission will do the trick? correct me if I'm wrong please.
Hi
Just thinking , some like to add a bit to the blue , how about a slider to add some to the blue channel :-*
Harry
Hi,Some objects only emit light at very specific wavelengths (H alpha, OIII, etc). This is emission radiation. Others such as stars emit light at all wavelengths (including H alpha). This is continuum radiation. So the Ha light from stars is just part of a continuum. So is any Ha light from reflection nebulae.
Thanks for the script - it is great and will be very helpful.
What is the difference: ha emission and continuum?
Best regards.
Herbert, Austria
RC2 solved the problems reported above with RC1 ?
Ha <- (Ha*RGB_bandwidth - RGB*Ha_bandwidth )/(RGB_bandwidth - Ha_bandwidth)
R <- R+(Ha-med(Ha))*HaMultiplier
Ha <- LinearFit(Ha with R)
I'm not sure what the intent is with this expression. .......
Now the problem with this method is that it is sound for Ha because the red channel can be used as Ha's broadband counterpart with a physical basis, but what happens with OIII, SII, etc? It remains unclear how to build a continuum map for these filters in practice; as I said above this is an open line of development.
Just a few suggestions regarding the interface:
- Simplify/organize input controls. Instead of the current stack of "Source NB to ..." items, consider defining three GroupBox controls for the R, G, B narrowband images.
- When a narrowband component isn't selected, the corresponding numerical items should be disabled.
Also I would rethink the suitability of ColorCalibration. For a narrowband combination, the broadband data should be pre-calibrated.
What should I use for the "White Balance Preview"?
Maybe it is good idea to totally remove this part of the script ? People ? ideas ?
Originally Silvercap implemented the "Vicent method" with these PixelMaths (free form):
Ha <- (Ha*RGB_bandwidth-RGB*Ha_bandwidth )/(RGB_bandwidth-Ha_bandwidth) - hmm , take out the stars ?
R <- R+(Ha-med(Ha))*HaMultiplier - not sure but, take out the nebula ? Leave only stars ? Continuum ?
Ha <- LinearFit(Ha with R)
R <- max(Ha,R)
The script do a linear fit between Red and Ha, then do the Vicent Peris pixelmath's with a little diference, in a third step the script do a max between original Ha and recombined HaR. Yes, I add Ha to Red.
this.Calculate_NBRGB = function() {this.showNBRGB = function() {One of the "promises" of Vicents method was to preserve star color (as well as star brightness) so that is why I am trying to understand it.
As I understand "Vicent's method" is still under investigation.
As I understand "Vicent's method" is still under investigation.
Vicent's method does not exist. In the Munich workshop I showed 7 different approeaches to HaRGB combination. Image processing is all about improvisation with good fundamental knowledge and a good eye to see what's happening in the image.
V.