Have been waiting for good breaks in the weather which usually means staying out on a work night. I have a really good image taken about 10 years ago but lost all the data.
I have a stacked NGC 5139 but the yellow stars appear a bit too orange. What would be the best way to change this without affecting other colours. Otherwise not a bad image.
100 x Lights
100 x Darks (maybe too many)
20 Flats
20 Biases
Stacked, Drizzled and colour corrected using SiriL
Simple post-processing simple using GIMP and
Noise reduction using Darktable.
Beautiful rendition Malcom! I too sometimes use GIMP for processing it's a very powerful piece of software and best of all free. I find the algorithms it uses for interpolation to be better than Photoshop.
Hi Malcolm
You have an excellent image in my view.
You ask about star colour.
What I suggested not cricket but I see these things as open to a little "human" intervention at the end..the artistic licence you may want to claim or not.
There are probably only a couple of stars that you are not happy with but even if a lot you can do this...I don't know how to do it in Gimp but I do have the largest version and am sure what I suggest is possible...make a solid colour layer in the colour you would prefer for your star, layer your image over the solid layer and use the rubber tool over the star to bring out the colour you like...very gently and I think you can select a blurred edge for the rubbers edge. You probably need to do fewer than you think as your eye most likely will "correct" others less orange...we see what we want to see but the brain needs some reference.
As I say it's not cricket but that's what I would do...hopefully someone will chime in saying don't listen to that idiot and give you something better.
Alex
Thanks, everyone for the comments, it's nice to be back into Photography after all these years away.
Alexander, appreciate the advice, I am learning new techniques and practices. There are a lot and many Photoshop tutorials, and now with the latest version of GIMP, I may be able to apply some of the features from Photoshop. Maybe, I will consider your method into mine when time permits.
Malcolm
That’s a nice Omega with good detail down to the core
Only one observation would be your colour bias, star field seems a bit mono with a greenish background hue around the inner and intermediate core areas
I use Startools so I can’t advise on your specific processing but maybe a suggestion would be to bump up your red and blue colour bias a bit to bring out a bit more colour
Other than that it’s a great image
Well done !!
Thanks Martin, that feels right, will work on getting colours better. I noticed a lot of my images are the same, wondering if this may be an artifact of an unmodded camera.
