Search found 68 matches

by Amaranthus
Sun Apr 11, 2021 10:27 am
Forum: General Discussion
Topic: M33 HaLRGB from IKO @ SGL Forums
Replies: 20
Views: 10334

Re: M33 HaLRGB from IKO @ SGL Forums

Thanks Ivo, that does make sense, now that I think on it after your explanation. To combine these would be more art, and not 'documentary'.

That said, I'm intrigued by the 'accent' approach you've tantalised us with --- will stay tuned!
by Amaranthus
Sat Apr 10, 2021 12:34 pm
Forum: General Discussion
Topic: M33 HaLRGB from IKO @ SGL Forums
Replies: 20
Views: 10334

Re: M33 HaLRGB from IKO @ SGL Forums

The practices of adding Ha+R to become a new red channel, or using Ha (Ha+L) as luminance, are definitely more universal (note that the former will skew visual spectrum colors of course, while the latter does not and is usually preferred). A query Ivo --- in v7, how does one create a (n exposure we...
by Amaranthus
Sun Nov 29, 2015 2:15 am
Forum: Tutorials & Guides
Topic: LRGB SynthLum - best method?
Replies: 3
Views: 7707

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: 5812

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: 5591

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: 4784

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: 4784

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: 5812

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: 5977

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: 5977

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...