Raw frames courtesy of Deep Sky West Remote Observatory in New Mexico, USA. (deepskywest.com) Data obtained with FSQ 106EDXiii / QSI683wsg / Lodestar / Paramount MyT.

21 hrs total integration (16x900s R, 16x900s G, 16x900s B, and 18x1800s H-alpha). The palette is RGB with H-alpha excess (i.e. H-a > R) being blended into R and B channels in 5/1 ratio to simulate H-beta contributions to the B channel.

Processing in PixInsight.

(I'm not completely happy with this one yet.... Field stars are still too prominent, colors not quite right. But I'll sit on it for a day or two...)

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Revision uses the H-channel as a Luminance channel. The RGB master already had an Ha excess contribution to R and B channels.

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Rev E: A careful reworking the original data, computing the H-alpha excess in the red channel, and using that excess to blend in presumed H-beta as well as H-alpha. There is a color shift toward the blue (red -> salmon red) when you do that. Applying a saturation stretch to the low-saturated values deepens the red from light-salmon red to what you see here.

The processing was also performed on a dithered upsampled image, then downsampled to original scale for final presentation.

H-alpha excess -> R + Hx, G + 23/25 * 7/20 * Hx, B + 7/20 * Hx. The factor 7/20 comes from the known ratio of H-alpha / H-beta = 2.87 in HII Regions. The factor 23/25 in the G channel comes from the fact that the color of H-beta is 23 parts G for every 25 parts B. H-beta is a sky-blue color.

Field star reduction was also applied to the luminance extract of the linear image. Both the resulting linear luminance and RGB composite were then stretched into visibility with the MaskedStretch operator in PixInsight, before blending the L channel into the RGB stretched image. Thereafter, the usual processing chain was applied, including HDRMT to get the details in the Jellyfish Nebula. Final noise reduction via TGVDenoise.