Eta Carina (Paul Hancock)

Eta Carina

Eta Carina in SHO.

I love Eric Coles histogram balancing technique and use it in most of my narrowband images. But I dislike the need to export the starless image to photoshop and have to work on layers using the unrefined lasso tool. It always leads to weird gradients, particularly in dark dust lanes within nebulosity.

So I have begun trying to use the technique using the histogram transformation tool within PixInsight. I think it shows promise.

B

Description: More histogram balancing.

Uploaded: ...

C

Description: Now with 6 hours of data.

Uploaded: ...

D

Description: Exponential Transform + Dark Strucure Enhance.

Uploaded: ...

E

Description: Better luminance masking, with LHE and saturation applied using the mask rather than globally.

Uploaded: ...

F

Description: Another reprocess. My stars are still causing me issues, I'm pretty sure it is the zwo filters and in particular the Oiii filter.

Uploaded: ...

G

Title: Eta Carina using Dynamic PixelMath Palette

Description: Here I wanted to blend an SHO image with a HOS image but rather than a fixed blend across all pixels, I used my data to create dynamic expressions.

First I did some stretching and balancing to get all three sii, ha and oiii images to about the same levels. I then removed the stars and set them aside for later.

I created the following images (starless) and then further boosted them using GHS.
o = oiii^~oiii
ho = (ha*oiii)^~(ha*oiii)
os = (oiii*sii)^~(oiii*sii)

I then used those images as the basis for some dynamic expressions.

R: o*sii + ~o*ha
G: ho*ha + ~ho*oiii
B: os*oiii + ~os*sii

I then did some saturation boosting and some hue adjustments to accentuate the pinks, yellows and browns.

Finally I used the ha image as a luminance with the LHE and USM applied to it.

Uploaded: ...

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Status	Basic failed
Started	...
Astrometry.net job	6370612
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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