OK Guys, sorry I didn't get back sooner with replies to all your questions.
As discussed with Graeme when I submitted the data, I did bin the Oiii and Sii and also combining the
Ha 3nm and 7nm I simply stacked each separately and then stacked the stacks in
Ha.
However I thought it would be a bit much to submit binned data "as is" so I registered all the filters to each other before uploading so you didn't have to mess about, especially if some of you don't have the software to do that. I didn't supply the fits files, just the already stacked and registered files for the same reason.
There was no noise reduction applied during stacking. The binned data was resized by the registering software (Registar) but not drizzled, though now you come to mention that I might even give that a try next time.
did she do this for the nii data ?
No Nii data.
Hope I have answered all the questions.
For those who don't know how to combine filters, you add them to the relevant channels. In this case I created a new image from one of the files and converted it to
RGB, then pasted the Sii into the Red channel,
Ha into the Green channel, and Oiii into the Blue channel to create an SHO Hubble palette image.
With narrowband you can do what you want really, some like to do HOO (
Ha into Red channel, and Oiii into Green and Blue.
Some-one asked to see my original image, and I did more than one version.
This was an HOS version (
Ha in the Red channel, Oiii in the Green Channel and Sii in the blue channel)
This was my SHO Hubble Palette version:
and this was my final version where I also added some
RGB stars into the mix, but I don't think I gave you the
RGB just for the stars as I thought that might be a bit too much, indeed it has taken me a number of years to work out how to do that.