[Bassnut (Fred)]

Originally Posted by leon

That is just awesome Fred, such detail and clarity.

leon

Thanks Leon

Originally Posted by gregbradley

Hi Fred,

Nice detail.

To me the colour is off. The core is magentaish whereas the core actually is yellowish.

The main disk really is more brownish with yellow hues. I have seen various renditions of this galaxy but the one I like the best is R Jay Gabany's.

He tends to be heavy with saturation so that is fine if others don't agree but his 253 is one of the absolute bests. Rob Gendler has one as well and he usually is pretty accurate with his colours.

I did not know colour create in CCDstack can clip colour histograms.

There is also some Ha in the disk if you have any Ha.

Greg.

Yes, I found the core to be yellow too, but I pushed it to match Jases and others. Sheesh, its hard to know sometimes what to do. Its not the colour combine so much in CCD stack, its saveing with the strectch option, there are no tweaks. I tried Ha, but it was woefull, only the core showed up, so yes there is Ha there. I hadnt thought of useing that in the core, good idea.

Originally Posted by drmorbius

I have no idea what you just said...

But it must be good because the results are fantastic... wow!

Thanks Randall

Originally Posted by jase

Are you happy with it Fred? You do realise that is all that counts. My comments are personal observations, not gospel. This is a fine tribute indeed. You've managed the colour channel gradients exceptionally well and, hey no clipping. Excellent display of detail with subtle hints of the notorious streamers that typically only mega data and careful processing can extract on NGC253. A lovely rendition to be proud of. Well done.

Geez thanks Jase. The streamers are almost impossible, not even sure if I can see them here at all. I can only recall a couple of images with them. Yes Im fairly happy with it now, thanks for the prod

Originally Posted by Peter Ward

Looks good to me Fred.

Thanks Peter, a rare treat from you .

Originally Posted by AlexN

And to think I thought it was brilliant before

Well done... Again!

Alex.

Thanks Alex, unforntunately, it can always be better, but one has to stop somewhere.

Originally Posted by Ric

Lovely rework Fred, this one has a real feel of depth to it.

Top stuff

The core does seem to sort of drop in, I hope thats the way it really is

Originally Posted by Tandum

Fred,
I like the image and colours, but, what would you need to do to capture the galaxy complete as matty did here -> http://www.iceinspace.com.au/forum/a...se.php?a=46449

The object seems to be too big for your setup. I like seeing these objects floating in space where they belong.

Yes Robin, the FOV isnt good, sitting whole in space would be nicer, but I didnt want to rotate the cam with a new set of darks. The F/R is already there so I cant zoom out.

Originally Posted by marc4darkskies

Nice image Fred, good detail - not purple like the last one. Shame your FOV's a little too narrow though. I don't have a very good monitor here at work but I tend to agree with Greg's comments re colour.



I NEVER save scaled TIFs out of CCDStack - limits my ability to properly scale, balance and tweak in PS (like you've discovered), and to reduce noise (I like to do that on the unstretched lum layer).



Hmmm. never noticed that - what artifacts are you talking about specifically? RGB combining in PS is for masochists Fred!!! CCDStack is best for that IMO.

Cheers, Marcus

Marcus, loading into PS unstreched with a low count ADU medium stack needs so much stretching that "combing" artifacts appear (spiky histogram) due to just a few (can be less than 8 bits) A/D levels becoming visible.

I like moving FITS into PS via fits liberator because it has very tweakable strectch algorithms. Unfortunately it cant handle RGB FITs, so the only way is to save RGB in CCD stack as TIFFs and directly into PS. I had trouble with colour create balances with mono subs in PS so tried colour create 1st in CCD stack, which is easy. Unfortunately the scale function in CCD stack clips (it maybe ive done something wrong, but I cant see it), its now back to seperate mono FITs.

If you are importing unstreched Lum, then you must have good data. 3nm Ha especially can be dense, but low ADU count.

Originally Posted by Jeffkop

Hmmm .. looks as good a picture as the original Fred, could be even better ... but these eyes cant pic it ... Either way, its still the best picture of this object Ive ever seen

LOL, hi praise Jeff, im chuffed