Search found 12 matches

by F-Astro
Wed Sep 23, 2020 3:51 pm
Forum: Image Processing Troubleshooting
Topic: Developing NGC7000 using ST: can I do better?
Replies: 14
Views: 618

Re: Developing NGC7000 using ST: can I do better?

Probably a dumb question No such thing! but with a DSLR like the OP has (or a OSC camera ), how did you obtain the red and green channel images you showed? The Compose module will automatically extract the right channel from a color dataset. E.g. if you click "Red/S-II" and then load a color datase...
by F-Astro
Tue Sep 22, 2020 2:34 pm
Forum: Image Processing Troubleshooting
Topic: Developing NGC7000 using ST: can I do better?
Replies: 14
Views: 618

Re: Developing NGC7000 using ST: can I do better?

You can see how out of focus the red channel is versus the green; CAsbs.jpg This is what causes the fringing and greenish star cores (if not remedied). Hi Ivo, Probably a dumb question, but with a DSLR like the OP has (or a OSC camera ), how did you obtain the red and green channel images you showe...
by F-Astro
Sat Sep 12, 2020 12:39 pm
Forum: Image Processing Troubleshooting
Topic: OSC Camera - How get colors closer to accurate?
Replies: 8
Views: 453

Re: OSC Camera - How get colors closer to accurate?

My advice is of limited value because my experience is solely at EAA. What I can tell you is that if the gradient is produced by UV / IR rays ( Ivo said), I always use this filter for the IMX294C chip and it works quite well for me: https://www.astroshop.es/filtros-l-rgb/astronomik-filtro-de-lumina...
by F-Astro
Sat Sep 12, 2020 12:30 pm
Forum: Image Processing Troubleshooting
Topic: OSC Camera - How get colors closer to accurate?
Replies: 8
Views: 453

Re: OSC Camera - How get colors closer to accurate?

Note that there may be some impossible-to-correct color skew if you did not use a UV/IR cut filter ( see here on why ). @elpajare Image has hideous rectangular vignetting. Stacking program problem? DSS has a long standing issue where even if you use Interesection mode, it leaves border of exactly o...
by F-Astro
Fri Sep 11, 2020 11:06 pm
Forum: Image Processing Troubleshooting
Topic: OSC Camera - How get colors closer to accurate?
Replies: 8
Views: 453

Re: OSC Camera - How get colors closer to accurate?

My opinion is not that of a specialist, please take it with reservations. Image has hideous rectangular vignetting. Stacking program problem? It also has a very horrible gradient, I have also used Wipe at 90% !! For the rest, the result is this that I put you. If it seems correct enough, I will tel...
by F-Astro
Fri Sep 11, 2020 5:46 pm
Forum: Image Processing Troubleshooting
Topic: OSC Camera - How get colors closer to accurate?
Replies: 8
Views: 453

Re: OSC Camera - How get colors closer to accurate?

OK, file was stacked with all recommended StarTools settings. Note that anybody who looks at this will need to crop out the strong blooming/lensing/?? effect at the top. I have no idea what is causing it, as CMOS sensors are not supposed to be susceptible to blooming and the 294 sensor is not known ...
by F-Astro
Fri Sep 11, 2020 4:46 pm
Forum: Image Processing Troubleshooting
Topic: OSC Camera - How get colors closer to accurate?
Replies: 8
Views: 453

OSC Camera - How get colors closer to accurate?

Hi, I am using a ZWO ASI294MC Pro one shot color (OSC) camera. I am having trouble with some files getting an accurate color rendition using the Scientific Color Constancy option in the color module. I'm hopeful someone can educate me on the best workflow to use. The images below show some quick and...
by F-Astro
Tue Sep 08, 2020 4:06 pm
Forum: Image Processing Troubleshooting
Topic: Small star cores are green - what am I doing wrong?!
Replies: 10
Views: 497

Re: Small star cores are green - what am I doing wrong?!

I think that was it - cores look normal (to my inexperienced eyes).

happy-kat :bow-yellow:



AFTER COLOR MODULE

HOT PIXEL CLEAN = OFF
NO Hot Pixel Cleaned color.jpg
NO Hot Pixel Cleaned color.jpg (255.72 KiB) Viewed 381 times
HOT PIXEL CLEAN = ON
Hot Pixel Cleaned color.jpg
Hot Pixel Cleaned color.jpg (317.22 KiB) Viewed 381 times
by F-Astro
Tue Sep 08, 2020 3:58 pm
Forum: Image Processing Troubleshooting
Topic: Small star cores are green - what am I doing wrong?!
Replies: 10
Views: 497

Re: Small star cores are green - what am I doing wrong?!

In DSS ensure hot pixel removal is not selected on the Cosmetic tab when stacking, I had thought this could cause the centre of the star to be spots, like the images Ivo shared. happy-kat, I owe you a beer! Many thanks for helping. I think your suggestion re not Detecting & Cleaning Hot Pixels on t...
by F-Astro
Tue Sep 08, 2020 3:31 pm
Forum: Image Processing Troubleshooting
Topic: Small star cores are green - what am I doing wrong?!
Replies: 10
Views: 497

Re: Small star cores are green - what am I doing wrong?!

Many thamls for uploading that Fran. This is an odd one. The stellar profiles look nothing like an Airy disc. There is a distinct "second plateau". It's almost like two different exposure times (or gains) were mixed? Selection_196.png and Selection_196.png Do all light frames look roughly the same?...