Search found 66 matches

by Amaranthus
Sun Nov 29, 2015 2:15 am
Forum: Tutorials & Guides
Topic: LRGB SynthLum - best method?
Replies: 3
Views: 4527

Re: LRGB SynthLum - best method?

Packen, I've typically used Ha as a substitute for L. Others blend it with the R channel, but it tends to affect colour in unrealistic ways.

See here for an example of a HaRGB I did recently: http://forum.startools.org/viewtopic.php?f=11&t=737
by Amaranthus
Fri Apr 10, 2015 12:35 am
Forum: General Discussion
Topic: Removal of Spikes from Reflector Telescope Images
Replies: 4
Views: 3126

Re: Removal of Spikes from Reflector Telescope Images

You can always drizzle-stack your APO images to improve their pixel resolution. I managed to image a fairly small planetary nebula at 480mm focal length, thanks to drizzling! http://www.astrobin.com/125368/
by Amaranthus
Fri Apr 10, 2015 12:33 am
Forum: General Discussion
Topic: Would like to get started but ...
Replies: 4
Views: 3250

Re: Would like to get started but ...

You could also try opening the TIF in Fitsworks and then re-saving as a .FIT

Then StarTools will definitely be able to open it.
by Amaranthus
Wed Apr 08, 2015 11:03 pm
Forum: Image Processing Troubleshooting
Topic: Problem With Colors on most DSOs - Specially M51
Replies: 4
Views: 2667

Re: Problem With Colors on most DSOs - Specially M51

I've done both (applied dcraw manually to the RAW files and then used the TIFFs in DSS, or let DSS do the debayering). I get more consistent and controlled results with the former. Search around on this forum for dcraw and you'll find recommendations from Ivo on what settings to use to get the 'clea...
by Amaranthus
Tue Apr 07, 2015 6:58 am
Forum: Image Processing Troubleshooting
Topic: Problem With Colors on most DSOs - Specially M51
Replies: 4
Views: 2667

Re: Problem With Colors on most DSOs - Specially M51

Did you get the debayering correct in DSS? My Sony NEX uses a RGGB pattern. You could also try applying dcraw directly - it should allocate the correct debayering. If you're happy that you've done this, and you can see the colour in DSS, then your image is probably desaturated, and the colours can b...
by Amaranthus
Tue Apr 07, 2015 6:53 am
Forum: General Discussion
Topic: Removal of Spikes from Reflector Telescope Images
Replies: 4
Views: 3126

Re: Removal of Spikes from Reflector Telescope Images

Best best is to use the "Synth" module - this allows you to modify the stars in various ways, including removing or modifying diffraction spikes, and even completely replacing your originals. YMMV.
by Amaranthus
Tue Apr 07, 2015 6:38 am
Forum: Gallery
Topic: NGC3532 - Wishing Well or Black Arrow?
Replies: 4
Views: 3792

Re: NGC3532 - Wishing Well or Black Arrow?

Thanks Andy! It's actually a challenging target, because the Ha emission nebula is difficult to draw out without overstretching the background Milky Way stars (too much and the background degrades into a graininess). It can look like quite a different object if one just concentrates on the cluster s...
by Amaranthus
Mon Apr 06, 2015 7:39 am
Forum: Gallery
Topic: NGC3532 - Wishing Well or Black Arrow?
Replies: 4
Views: 3792

Re: NGC3532 - Wishing Well or Black Arrow?

Thanks Ivo, I appreciate that - I put a fair bit of thought into the framing, and followed your SynthLum tutorial closely with the processing - it was really helpful. It was also a bit 'zen' like - I mucked about with the data for quite a while, then threw out my efforts and went with a fairly strai...
by Amaranthus
Mon Apr 06, 2015 6:13 am
Forum: Gallery
Topic: NGC3532 - Wishing Well or Black Arrow?
Replies: 4
Views: 3792

NGC3532 - Wishing Well or Black Arrow?

Take your pick! Also known as the 'Black Arrow', this spectacular open cluster in Carina covers an area of about 60' x 30', and sparkles with over 100 blue and yellow stars of even brightness. They look somewhat like a collection of coins shimmering at the bottom of a wishing well. This cluster is c...
by Amaranthus
Sun Apr 05, 2015 7:43 am
Forum: General Discussion
Topic: Promoting Startools?
Replies: 3
Views: 3197

Re: Promoting Startools?

In a way, the lack of pre-processing in ST turned out to be an intellectual bonus to me. It really forced me to understand exactly what I was doing with calibration and stacking, because I had to juggle a number of different free or low-cost programs to get the full results I was after. I now have s...