Recent Posts

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91
Astrophotography / Re: Cave Nebula LRGB
« Last post by julian on Oct 13, 2017, 14:49:22 »
Very nice Carole.
92
Astrophotography / Re: Cave Nebula LRGB UPDATED
« Last post by Carole on Oct 13, 2017, 12:13:24 »
This is the version using Mark's great photoshop star colour process.
Much happier with this now and will certainly use this process again when doing broadband images.

93
Technical / Re: PixInsight ArcsinhStretch
« Last post by Carole on Oct 13, 2017, 12:06:19 »
OK, I have uploaded my Cave Nebula comparing my process with Mark's Star colour process as above.

My processed image:


My image but after using Mark's PS Star colour preserving process (above):
94
Technical / Re: PixInsight ArcsinhStretch
« Last post by Carole on Oct 13, 2017, 11:05:52 »
OK Mark, well I have managed to write some actions for this. 
I have done it in two parts.

Part one (up to number 6 in the instructions) works well on both your sample image and on mine, but part two (the rest of the instructions) only seems to work on my RGB filter image, but not on your sample OSC image.

Even 1 - 6  Cuts out a lot of the fiddle though. 

Should be able to E Mail a link for actions, but have yet to find out how to do that.  If I find out will send you the link/s.

Carole
95
Announcements, Meetings, Events / Re: Next DSC 20 - 22nd October
« Last post by Apophis on Oct 13, 2017, 10:09:17 »
I`m staying sat night aswell so can i go for F & C please.
Roger
96
Announcements, Meetings, Events / Re: Next DSC 20 - 22nd October
« Last post by Carole on Oct 13, 2017, 09:55:50 »
Food feedback

Carole  - F&C or Chinese
Davey T - F&C
Mark - F&C
Julian
Mac
Ray D
Roger F&C
97
Technical / Re: PixInsight ArcsinhStretch
« Last post by doug on Oct 13, 2017, 09:50:43 »
     Well done Mark. Another feather in your cap.....

    Doug.
98
Technical / Re: PixInsight ArcsinhStretch
« Last post by Carole on Oct 13, 2017, 09:47:13 »
Ah, got it.  I just call white balance, colour balance. 
I did have to do a colour balance at the end as it ended up very Magenta, so will do it at the beginning next time. 

In the past I would always start to process RGB data as having to combine them as mono filters I needed to see the stars more clearly to check I had lined them all up properly, but this did seem to work oK, I guess I could slide the stars around afterwards if necessary. 

I have never created an action before either, but worked it out.  It only appeared to do part of the action, so will give it another try and see if I can work out where it stops.  If it does 3/4 of the action it will save some time.

Thanks so much Mark, yes a good idea for an imaging session demo, thanks for that.

Carole
99
Technical / Re: PixInsight ArcsinhStretch
« Last post by MarkS on Oct 13, 2017, 06:33:14 »
Hi Carole,

I knew you would like it!

As for terminology:
White balance is just getting the colours right in the first place i.e. the multipliers for the RGB channels so the star colours are correct at the start.
Background subtraction is just removing the light pollution - as you say, the levels sliders do this well.

I've no idea about how to make actions but it sounds like a good idea if you can make it work.  I wonder why Photoshop changed the way gamma works?  It makes it quite confusing when migrating onto a later version.

Maybe you should demo this at your imaging evening ;)

Mark
100
Technical / Re: PixInsight ArcsinhStretch
« Last post by Carole on Oct 13, 2017, 00:53:08 »
That's brilliant Mark, I have tried it both on your sample image and also on my Cave Nebula LRGB image and there is definitely a lot more star colour in the final result.

I tried to make an action for it so I didn't have to keep repeating all the steps, but it would not work, but by the time I had done the process a few times, I got used to it anyway.  (Maybe it just didn't apply the curve function, I might try that again).

My version of PS is C3 and so I applied gamma 2.5. 

The only thing I wasn't quite sure about and I am sure this is just terminology is your statement:
Quote
stacked linear data (i.e. data with no stretches performed on it) and that you have applied white balance and background subtraction.
i.e. applying white balance and subtraction, I have no idea what action that is, but I just did a little levels bringing the slider in to the histogram each side, and that seemed to work OK.

Bonus: I don't have to bother about getting my head (and purse) around Pixinsight.

Carole

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