Rho-Ophiuchi Complex

Joshua Bunn (Joshua) · #1 06-07-2018, 01:32 AM

The Rho-Ophiuchi Complex. A Ha(HaR)GB blend, photographed with a Samyang 135mm F2 lens and STL11000m SBIG camera.

For some reason, I could not get much blue out out of this image... not like i see in other peoples images of this area...

Exposures were:
44 x 150sec of blue.
45 x 90sec of green
46 x 180sec of red
20 x 1800sec of Ha (5nm)

constructive comments welcome

Josh

JA · #2 06-07-2018, 04:05 AM

Lovely image Josh

Best
JA

h0ughy (David) · #3 06-07-2018, 12:36 PM

must be happy with that

multiweb (Marc) · #4 06-07-2018, 04:36 PM

Very deep shot.

I reckon that's why you're having trouble picking up the blue reflection nebs. Your Ha is probably overwhelming the area.

gregbradley · #5 06-07-2018, 07:03 PM

A wonderful image.

As Marc says Ha can dominate as its often the strongest. How did you blend the Ha in? Does the RGB by itself have more blue in it?

Greg.

atalas · #6 06-07-2018, 10:22 PM

Good work Joshua.....a favorite.

Joshua Bunn (Joshua) · #7 07-07-2018, 01:22 PM

Thanks Guys.
I blended the Ha using screen mode and adjusted the amount to taste, Just had a play around with the straight RGB and in no time, I am able to get more colour out of the image. The current version looks a little "dirty" for lack of better word I think. I might redo it.

Josh

leon · #8 07-07-2018, 02:07 PM

Excellent work Joshua, crisp and spot on, love it.

Leon

gregbradley · #9 07-07-2018, 02:32 PM

Quote:

Originally Posted by Joshua Bunn

Thanks Guys.
I blended the Ha using screen mode and adjusted the amount to taste, Just had a play around with the straight RGB and in no time, I am able to get more colour out of the image. The current version looks a little "dirty" for lack of better word I think. I might redo it.

Josh

Try lighten mode or lighter colour mode or even soft light mode.

Greg.

LewisM · #10 07-07-2018, 02:55 PM

I took the liberty of examining the image in PixInsight, and found the blue is quite clipped (as well as the green to less extent) and a possibly over-stretched red. This could account for the lack of showing blue.

Joshua Bunn (Joshua) · #11 10-07-2018, 02:29 PM

Thankyou Greg, Leon and Lewis. Lewis and Greg, thanks for pointing those points out, I'll redo this image

Josh

RickS (Rick) · #12 30-07-2018, 06:19 PM

Looks good, Josh, but hard to appreciate the compressed IIS image.