Ngc6744

[alistairsam]

Another one from Vicsouth.
About 30mins of Lum and 10mins each of RGB, 1hr total.

larger version here
http://www.astrobin.com/full/134058/0/

10inchF4, NEQ6Pro, Orion Steadystar AO - 4Hz
Stacked in Maxim, processed in Startools.

Cheers
Alistair

[RickS]

Another nice one, Alastair!

[alpal]

Hi Alistair,
quite a good pic there although I am on a re-processing binge today
& would like to have a go with your pic too.
I think it has too much of one colour - a strange blue.
Would that be OK if I post another version?

cheers
Allan

[alistairsam]

Sure but I'll post a link to the fits instead so you can start from scratch
I did increase the blue, might tone it down

[alpal]

Hi Alistair,
OK - I had a go & there is some lovely color in the data but I won't post it.

cheers
Allan

[Placidus]

Quite beautiful. A delicate touch.

[Rod771]

That's looking good :thumbsup: Well done Alistair!

[alistairsam]

Thanks for the comments Gents.
Need more time on this.

Allan, anyone else, here are two stacked lrgb fits files, one in lab and one in rgb. They're 99MB each though.
https://www.dropbox.com/sh/eg8w74f20xi4tzm/AAA-7_IIW5hs5ayrDxQvKE2ha?dl=0

The lab colour file is still uploading, should be done in 11mins.


Cheers
Alistair

[Rex]

Nice detail Alistair. Great shot.

[cometcatcher]

There's a lot there for an hour. Great shot!

[alpal]

Hi Alistair,
I had a quick go at the FITS file for RGB.
It didn't come out blue at all but quite red.
I'll have to have another look tomorrow as I'm confused.
It came out like this.

cheers
Allan

[alistairsam]

hi Allan,

yep, not sure why it had an orange cast, but a color wipe in startools removed that and shifted it to blue. I did some adjustments in the color module to reduce the red bias, hence the blue.
It was at an altitude of around 38degrees when I imaged it, so it can't be light pollution that normally shows up even in dark skies if you go below 25 degrees, so not sure why.
I think I applied the measured G2V ratio for my filters and ccd when combining in maxim, I'll try again without any change in ratio.
the ratio I measured in ccdautopilot was 1.13:1:1.32 R:G:B.
edit: I did a combine with a 1:1:1 ratio and its a lot more yellower. the G2V ratio gives a manageable white balance.

Cheers
Alistair

[alpal]

Hi Alistair,
Yes - there is something strange with colours.
I reprocessed & swapped the Red & Blue channels to get this:

cheers

Allan

[Rex]

Just for the sake of it I also annotated this one for you Alistair. Again, great image.

[strongmanmike]

Good one Alistair, a fine image of this galaxy really..except for the colour :question:...not sure what is going on there though? Allan should be able to sort it for you he is the resident IIS repro guru...took the mantle from me..but with other peoples data :lol: :thumbsup:

Mike

[alistairsam]

Thanks Mike, Allan,

I think I know what went wrong, I must not have chosen the red filter in Maxim's sequence for Red and chose the green filter instead, the fits headers confirm that.
I found one sub with Red, so will re-process and try again.

Cheers
Alistair

[alpal]

Hi Mike,
Louie is the processing guru:
see his videos here:
https://www.youtube.com/channel/UCJ5b6pFHBGe66vsuSaXb-0A

When have you ever been cheeky enough to reprocess someone else's data? :)

I am just bored that I can't get the opportunity to set up my astro gear.
The only nights where it's possible are on Friday or Saturday & it's always been cloudy in Melbourne -
well for the last 6 months anyway!
I am beginning to think that a remote robotic scope is the only way to go.
( either that or being retired)

cheers
Allan

[alpal]

Really?
Ok - let's see what you can do with the correct colours.
I did that once but picked it up before stacking because a red frame
stood out from the others when I previewed them all in DSS.
It looked like a Green frame & it was.

cheers
Allan

[Ross G]

Great capture Alistair.

Nice detail.

Ross.

[strongmanmike]

:lol: Hey, I only reprocessed my own data over and over...thus instigating the term "doing a Sidonio" or "Sidonioed" :P...don't hear it much
anymore :question:

Sorry Alistair, we'll shut up now :P

Mike

[alistairsam]

The red sub was unusable so just adjusted colours on the original GGB version in PS to remove the Purple Hue.

http://www.astrobin.com/full/134058/B/

Hope the weather holds up for the next new moon weekend, will get some decent exposure time on this.

Cheers
Alistair

[byronpaul]

Alistair,

mate ..... that last image is nice !!!!!!!!!!!!!!!!!!!!

Paul