SMC in HaOiiiLRGB - Page 2

RickS (Rick) · #21 21-09-2015, 02:37 PM

Quote:

Originally Posted by Octane

Simply outstanding!

I'm having issues with stitching mine; residual gradients along frame edges.

H

Thanks, H. What are you using to assemble the mosaic?

Quote:

Originally Posted by marc4darkskies

Very nicely done indeed Rick!

You've managed to walk the fine line between overstating and understating the Ha!

Thanks very much, Marcus.

Quote:

Originally Posted by Camelopardalis

Nice one Rick

looks like someone set off some fireworks up there

And thanks, Dunk!

topheart · #22 21-09-2015, 02:42 PM

Wow Rick..... that's good!!

I am currently attempting a 9 panel mosaic of this with the BRC250...not sure a mosaic of this size will be feasible in this part of the sky.....I am capturing HARGB.....how much did the O3 add to the image you have taken , do you think??

Maybe I should capture data in O3 as well...?

Many thanks,
Tim

RickS (Rick) · #23 21-09-2015, 03:07 PM

Quote:

Originally Posted by topheart

Wow Rick..... that's good!!

I am currently attempting a 9 panel mosaic of this with the BRC250...not sure a mosaic of this size will be feasible in this part of the sky.....I am capturing HARGB.....how much did the O3 add to the image you have taken , do you think??

Maybe I should capture data in O3 as well...?

Many thanks,
Tim

Thanks, Tim. Good luck with the mosaic! I think the Oiii was a useful addition. It has a distribution which is different enough to the Ha to be interesting. I can post Ha and Oiii mono images tonight if that's helpful.

Cheers,
Rick.

Octane (Humayun) · #24 21-09-2015, 06:55 PM

Rick,

I'm DBE'ing each calibrated master panel and then using GMM to join.

Once I GMM the RGB data, I can see red gradients along the edges.

H

topheart · #25 21-09-2015, 07:32 PM

Thanks Rick ....yes, please post the Ha and O3 data - that would be very useful!!

Thanks again!
Tim

RickS (Rick) · #26 21-09-2015, 07:36 PM

Quote:

Originally Posted by topheart

Thanks Rick ....yes, please post the Ha and O3 data - that would be very useful!!

Thanks again!
Tim

Tim,

I've just been playing around creating an animated GIF to show the difference. Here 'tis: https://rickstevenson.smugmug.com/ph.../i-jxgKXkK.gif

Hope that helps...

Cheers,
Rick.

RickS (Rick) · #27 21-09-2015, 07:44 PM

Quote:

Originally Posted by Octane

Rick,

I'm DBE'ing each calibrated master panel and then using GMM to join.

Once I GMM the RGB data, I can see red gradients along the edges.

H

H,

So you're stitching full RGB frames, I guess. I've only done mosaics by stitching each filter individually and then colour combining afterwards. With good quality data I was able to stitch it together while still linear. More dodgy data needed to be stretched first.

I assume you did the StarAlignment thing with Frame Adaption enabled earlier in the process? It might be possible to do some PixelMath magic to make the panels more compatible but that shouldn't be necessary.

Cheers,
Rick.

Octane (Humayun) · #28 21-09-2015, 09:21 PM

Sorry, I should have said, I am stitching each filter separately.

So, I have a L mosaic, R mosaic, G mosaic and B mosaic.

Once I LRGBCombination the RGB and perform an STF, there are red gradients around where the frames combine.

H

Octane (Humayun) · #29 21-09-2015, 09:22 PM

And, yes, the data is still linear and I used frame adaptation to make the scaffold that GMM later used.

H

Nicola (Nicola) · #30 22-09-2015, 02:01 AM

Very nice image. I am always amazed by the fact there are almost only blue stars...when I first imaged it I thought I made some mistake in color calibration!!

gvanhau (Geert) · #31 22-09-2015, 03:14 AM

Very Nice Rick.

I can clearly see the difference due to te influence on Ha.
The OIII is not so clear to me.

Geert

Geoff45 (Geoff) · #32 22-09-2015, 09:01 AM

The difference between your two images is remarkable. Just imagine what's going on on all the other parts of the spectrum--radio, uv, ir, xray....
Geoff

topheart · #33 22-09-2015, 09:48 AM

Thanks very much Rick. The animation shows it up nicely!

Cheers,
Tim

RickS (Rick) · #34 22-09-2015, 09:51 AM

Quote:

Originally Posted by Nicola

Very nice image. I am always amazed by the fact there are almost only blue stars...when I first imaged it I thought I made some mistake in color calibration!!

Thanks, Nicola!

Quote:

Originally Posted by gvanhau

Very Nice Rick.

I can clearly see the difference due to te influence on Ha.
The OIII is not so clear to me.

Geert

Thanks, Geert. The influence of the Oiii is more subtle. The animated GIF I posted shows it nicely, I think:
https://rickstevenson.smugmug.com/ph.../i-jxgKXkK.gif

Quote:

Originally Posted by Geoff45

The difference between your two images is remarkable. Just imagine what's going on on all the other parts of the spectrum--radio, uv, ir, xray....
Geoff

I had enough trouble blending 5 colours, Geoff

But you make a good point. There's a catalog of 717 radio-continuum sources in the SMC just to begin with!

Cheers,
Rick.

RickS (Rick) · #35 22-09-2015, 09:57 AM

Quote:

Originally Posted by Octane

Sorry, I should have said, I am stitching each filter separately.

So, I have a L mosaic, R mosaic, G mosaic and B mosaic.

Once I LRGBCombination the RGB and perform an STF, there are red gradients around where the frames combine.

H

Hmmm, that's really weird and a huge PITA. Are the gradients visible in the stitched R image (or as negative gradients in G/B?)

I don't have any inspired suggestions. Might be worth trying an RGB combine on a couple of adjacent panels and then stitching them to see if that's an improvement.

Cheers,
Rick.

Octane (Humayun) · #36 22-09-2015, 12:10 PM

Before I try that, I might just take my drizzled RGB frames and build a mosaic first, then, run DBE (and, linear fit after that) to see if that helps.

I'll have a look when I get home and see if I can find any inverse gradients in the green and blue.

Sorry to hijack your post!

H

rustigsmed (Russell) · #37 22-09-2015, 12:25 PM

That is really fantastic Rick.
I reckon you have nailed the colours, keeping the NB looking 'naturalistic' and not too overbearing. The Oiii adds an extra dimension, it looks like there are heaps of ngc 3324's over there.

cheers

russ

RickS (Rick) · #38 22-09-2015, 01:14 PM

Quote:

Originally Posted by Octane

Before I try that, I might just take my drizzled RGB frames and build a mosaic first, then, run DBE (and, linear fit after that) to see if that helps.

I'll have a look when I get home and see if I can find any inverse gradients in the green and blue.

Sorry to hijack your post!

H

Yep, that's worth a try, H. Worst case you could try building a mosaic from stretched RGB panels (I presume you were talking linear RGB above.)

No apology needed

Cheers,
Rick.

RickS (Rick) · #39 22-09-2015, 01:18 PM

Quote:

Originally Posted by rustigsmed

That is really fantastic Rick.
I reckon you have nailed the colours, keeping the NB looking 'naturalistic' and not too overbearing. The Oiii adds an extra dimension, it looks like there are heaps of ngc 3324's over there.

cheers

russ

Thanks very much, Russ. It's a shame the SMC isn't closer!

el_draco (Rom) · #40 22-09-2015, 03:11 PM

Detail in this image is SUPERB. Wow!