The Fish Head Nebula - IC1795 - HSO mapped to RGB (Eric Coles (coles44))

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1795 · LBN 645 · LBN 647 · LDN 1359 · NGC 896

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The Fish Head Nebula - IC1795 - HSO mapped to RGB

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The Fish Head Nebula - IC1795 - HSO mapped to RGB

Narrowband mapping to simulate and RGB image - This is another way to map SHO data to simulate an RGB image and still express the three element emissions. In this image H was mapped to Red (as you would expect), S to Green (now that's different) and O to Blue (again as you would expect). This is done with the linear images in PixInsight. Thereafter, the following steps are followed.

1. Background and color correction is done with PhotometricColorCalibration (not what you expected). That works and produces what looks like an ordinary RGB linear image.
2. The green tinge is removed by SCNR.
3. Stretching can be done in different ways. In this case I used ArchsinhStretch to maintain star color (yes, you get colored stars).
4. The remainder of the processing is done in Photoshop in the usual way. Nothing special there.

There are other ways to simulate an RGB image using NB data. I am just presenting one more here. Aside from the imaging being basically red (as you would expect), you can see the S emission expressed as the orange rim around the head of the Fish, even though we know that this emission is a deep, deep red. That is a different feature of this method of color mapping.

If you have thoughts on this process, please let me know.

Eric

Sharpless2 Objects
Narrowband imaging

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	6427857
PixInsight job	GKOMLZV69LZYJIR6POQGM026PNFUNPVE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h26m13s.431
RA (top/left)	02h28m27s.288
RA (top/right)	02h23m58s.397
RA (bottom/right)	02h24m01s.126
RA (bottom/left)	02h28m26s.973

Dec (center)	+62°01′54″.20
Dec (top/left)	+62°12′23″.87
Dec (top/right)	+62°12′10″.75
Dec (bottom/right)	+61°51′15″.82
Dec (bottom/left)	+61°51′29″.17

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The Fish Head Nebula - IC1795 - HSO mapped to RGB

The Fish Head Nebula - IC1795 - HSO mapped to RGB

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The Fish Head Nebula - IC1795 - HSO mapped to RGB

The Fish Head Nebula - IC1795 - HSO mapped to RGB

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