Adding OIII data to an image

[Batch]

Hi,

I would like to add some OIII data of the a Veil Nebula that I captured last night to some existing RGB data that I captured last week (used a modified DSLR for both sessions). What is the best way to do this? Thanks.

Bill

[pfile]

given the following: the main OIII line is at about 500nm, and googling "pantone 500nm" yields this page:

http://encycolorpedia.com/00b8e0

"In the RGB color model #00b8e0 is comprised of 0% red, 72.16% green and 87.84% blue."

i've usually blended in my OIII data to my green channel data at 72% strength and at 88% strength into blue. you can do this by using linear fit to normalize the signal strength of your OIII to the green channel, then use pixelmath to scale the OIII to 72%, then average the green and scaled OIII. repeat for blue channel on a fresh copy of the OIII.

i have no idea if this is a legitimate technique, but that's what i've done in the past.

rob

[Batch]

Thanks Rob....I'll give that a try.

Bill

[jkmorse]

Rob,

Any chance you have similar statistics for Ha and SII 

Would love to get your insights if you do.

Thanks,

Jim

[NGC7789]

Does this help?

http://academo.org/demos/wavelength-to-colour-relationship/

What's interesting is that it appears that 656 is out of gamut. It goes to 255 red just before that.

[pfile]

ha is 656.281nm as NGC7789 says, and yeah, it's redder than red so that one just goes into the R channel at 100%.

hydrogen-beta is 486nm, and again from here: http://encycolorpedia.com/002b5e you have that as 0% red, 17% green and 37% blue. i have mixed in Ha at those percentages to simulate Hb but this is fraught with danger as Ha and Hb extinction are going to be very different.

sii is i think also pretty much pure red (673nm), and out of gamut as well.

rob