<p>I do some narrow band imaging and believe the most likely cause is you have stretched the SII channel to far. Most likely it is the weakest of the three. Also, I never use a luminance channel on narrow band. But if you must, I would sum the three channels and not just use a single channel. </p>

CC BY-SA 3.0
2016-08-31T10:51:41.187Z
Ty for the info :) It seems very likely that this was introduced in my post processing steps (probabnly in the auto stretch and Color Calibration step)
RononDex
CC BY-SA 3.0
2016-08-30T10:14:11.290Z
2016-08-30T10:14:11.290Z
Off Grid Bob
<p><a href="https://i.sstatic.net/llpUZ.jpg" rel="noreferrer"><img src="https://i.sstatic.net/llpUZ.jpg" alt="IC5070 - The pelican nebula" /></a></p>
<p>This is my first try in false color imaging. The target was IC5070 - the pelican nebula. I took around 3 hours of data (around 1h for Ha, SII and OIII). Then after stacking did an LRGB combination in PixInsight using Ha for red, SII for green and OIII for blue. For luminance I used the stacked Ha image.</p>
<p>Now my question is, why are most of these stars so green? It would suggest that they were really bright in the silicon spectrum right? If so wouldn't that mean that those stars are extremly silicon heavy?</p>
<p>(Ignore the vertical blue-green line, its a stacking artifact resulting from a camera defect on those pixels)</p>

CC BY-SA 3.0
2016-08-26T14:44:14.573Z
SII is sulfur, not silicon: http://www.astronomik.com/en/photographic-filters/sii-ccd-filter.html
Wayfaring Stranger
CC BY-SA 3.0
2016-08-29T08:12:29.773Z
@WayfaringStranger Ah I see, that makes much more sense :D
RononDex
<amateur-observing><photography>
Why are the stars in my image so green (false color image, HSO palette)?
RononDex
# Why are the stars in my image so green (false color image, HSO palette)?

(Asked by: username_0 on 2016-08-26)

[![IC5070 - The pelican nebula](https://i.sstatic.net/llpUZ.jpg)](https://i.sstatic.net/llpUZ.jpg)

This is my first try in false color imaging. The target was IC5070 - the pelican nebula. I took around 3 hours of data (around 1h for Ha, SII and OIII). Then after stacking did an LRGB combination in PixInsight using Ha for red, SII for green and OIII for blue. For luminance I used the stacked Ha image.

Now my question is, why are most of these stars so green? It would suggest that they were really bright in the silicon spectrum right? If so wouldn't that mean that those stars are extremly silicon heavy?

(Ignore the vertical blue-green line, its a stacking artifact resulting from a camera defect on those pixels)

**Tags:** amateur-observing, photography

> **Comments:**
> **username_1**: SII is sulfur, not silicon: http://www.astronomik.com/en/photographic-filters/sii-ccd-filter.html  
> **username_0**: @username_1 Ah I see, that makes much more sense :D  

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## 1 answers

### Answer by username_2 on 2016-08-30. Score: 4 | Accepted answer

I do some narrow band imaging and believe the most likely cause is you have stretched the SII channel to far. Most likely it is the weakest of the three. Also, I never use a luminance channel on narrow band. But if you must, I would sum the three channels and not just use a single channel.

> **Comments:**
> **username_0**: Ty for the info :) It seems very likely that this was introduced in my post processing steps (probabnly in the auto stretch and Color Calibration step)  

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