Quote:
Originally Posted by Bassnut
For what it is , the neb came out much better than the stars. Are the dark rings around the stars processing artifacts?.
Cheers
|
Yep, webcams do that on bright objects at long exposures. It's also called Black-eye.
The slightly 'blacker' sky helps too thanks Fred.
Quote:
|
Originally Posted by Astroman
I like the detail present in the right hand shot (Carina 2) But the stars are too crunchy, maybe try and soften the stars up a wee bit. The colour balance in Carina 2 is a bit off as well, more leaning into the blues, maybe try and adjust the balance so there isn't quite as much there. The contrast on both is extremely good, although Carina 2 is more contrasty. I can see more Neb in Carina 1 but if you stack more images or adjust the levels in Carina 2 I am guessing you could bring out more. Did you dark frame subtract? to me it doesn't look like it, maybe do a dark frame subtraction to remove those extra stars that are in both images, it will clean up a bit of the background noise too.
|
Stars are crunchy, colour is off, etc coz they aren't properly processed yet.
And No, no darks subtracted in either image. They are a wee bit noisy coz there are only 3 frames stacked in each image.
The Imaging differences:
The ONLY difference between the 2 images is that Number 1 was taken at 3x90 seconds with
no filters. Just raw Toucam.
Number 2 was at 3x120 seconds (had to bump it up to see the nebula) with the
Astronomiks IR/UV filter in place.
To get the nebula to show up with a filter equally as without a filter means the exposure time has to be increased, which introduces more Amp Glow.
The only processing done to them was 'Space Noise Removal' & 'Sharpen', then brightness down a tad, and contrast up a tad.