IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters (rhedden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: IC 1396

IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters, rhedden

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IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

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IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

IC 1396 is the well-known Elephant Trunk nebula in Cepheus. This image is comprised of data taken through H, R, G, and B filters.

When I processed this image with RGB colors, the nearly solid red nebula left something to be desired. I wished I could transform the image into the Hubble palette that is commonly used with SHO data. After much experimentation, the following result was obtained by using H-alpha alone as luminance and performing an unconventional combination of the four filters in the R, G, and B channels.

The R channel is pure broadband red.

The B channel is broadband green multiplied by broadband blue. The pseudo-science behind the multiplication is that both the green and blue data contain the Oiii emission line, so multiplying them emphasizes pixels that contain Oiii emissions. Therefore, Blue*Green can serve as a synthetic Oiii channel.

The G channel is a ternary blend of 1) broadband red, 2) H-alpha, and 3) Blue*Green, or “synthetic Oiii.” I constructed it using the channel mixer feature in GIMP; the composition is about 30% red, 25% H-alpha, and 45% synthetic Oiii.

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Description: Increased the color saturation a bit in this version.

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Astrometry.net job	5364069
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IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

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IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

IC 1396: Elephant Trunk - Synthetic SHO from HRGB filters

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