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Thread: IC 1396 - Elephant Trunk

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    Default IC 1396 - Elephant Trunk



    Greetings,

    This is a reprocess of some 2016 data captured for a mosaic of this nebula. This is from 1 of 4 panels and is cropped to the trunk itself.

    This is processed using PixInsight. The Ha is binned at 1x1 with 12 600” exposures. The Sii and Oiii are binned 2x2 with 12 900” exposures each. The Luminance channel was created using the Ha data and processed separately.

    The individual channels were processed using ImageCalibration, CosmeticCorrection, SubframeSelection, StarAlignment, LocalNormalization, ImageIntegration and DrizzleIntegration. Ha drizzle scale of 1 and Sii/Oiii drizzle scale of 2.

    The individual integrated images were aligned using StarAlignment, cropped with DynamicCrop, gradients removed with DynamicBackgroundExtraction, linear noise reduction with MultiscaleLinearTransform, and stretched using MaskedStretch.

    Prior to combining the channels I applied several iterations of MorphologicalTransformation to both Sii and Oii using morphological selection with a contour star mask applied. This was to bring the stars more in line with the Ha stars to reduce magneta and/or blue rings post combination.

    Sii and Oiii were LinearFit to Ha and the color image created using PixelMath with Sii to Red, Ha to Green and Oiii to Blue.

    Final color processing involved ColorMask for Magenta, Green, Cyan and Yellow mask adjustments using CurvesTransformation, SCNR at numerous steps throughout to reduce Green, further CurvesTransformation to bring out Blues and Golds, ACDNR against Chrominance, and CurvesTransformation to adjust RGBK, L and S curves.

    Luminance was created as a duplicate of Ha right after gradient removal. Luminance was then processed using Deconvolution, linear noise reduction with MultiscaleLinearTransform, and stretched using MaskedStretch. Further proceeding to achieve details included LocalHistogramEqualization, CurvesTransformation, TGVDenoise and MutliscaleLinearTransformation to sharpen detail.

    Final image created by first applying 3 iterations of ATrousWaveletTransformation with 4 layers and all layers except Residual disabled to the RGB image. Then LRGBCombination was applied to the blurred RGB image with L set to the Luminance image, R, G, and B disabled, and Saturation lowered to boost color. Final CurveTransformation iterations for Hue, Saturation and RGB shifts, and focused ColorSaturation iterations. Lastly DarkStructureEnhancement and ICCProfileTransformation.

    Full res:
    https://www.astrobin.com/full/415178/B/?real=&mod=




    Sent from my iPhone using Tapatalk Pro

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    Default Re: IC 1396 - Elephant Trunk

    Very nice Bradley - I especially like your nice treatment of the stars to prevent bloating and artifacts. Well done.

    Thanks also for the description of your processing flow. Much appreciated.

    Steve
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    Default Re: IC 1396 - Elephant Trunk

    very nice reduced star image, soft and silky dreamer of an image! i want to sing a lullaby!

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    Default Re: IC 1396 - Elephant Trunk

    Beautiful thanks for sharing



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    Default Re: IC 1396 - Elephant Trunk

    Nice reprocess Brad.
    Jim Thommes

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    Default Re: IC 1396 - Elephant Trunk

    Hi Bradley. The full resolution on your astrobin site of the Elephant's Trunk (IC 1396) knocked my socks off today . Beautiful pinpointed stars, lots of details and dusty cloud remains. Thanks for sharing this superb astrophoto with us, and keep up this great DSO work.
    - Marshall

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    Default

    Quote Originally Posted by Makuser View Post
    Hi Bradley. The full resolution on your astrobin site of the Elephant's Trunk (IC 1396) knocked my socks off today . Beautiful pinpointed stars, lots of details and dusty cloud remains. Thanks for sharing this superb astrophoto with us, and keep up this great DSO work.
    Quote Originally Posted by jthommes View Post
    Nice reprocess Brad.
    Quote Originally Posted by Mirrorgirl View Post
    Beautiful thanks for sharing



    Rhoda
    Quote Originally Posted by yobbo89 View Post
    very nice reduced star image, soft and silky dreamer of an image! i want to sing a lullaby!
    Quote Originally Posted by STEVE333 View Post
    Very nice Bradley - I especially like your nice treatment of the stars to prevent bloating and artifacts. Well done.

    Thanks also for the description of your processing flow. Much appreciated.

    Steve
    Thanks everybody!


    Sent from my iPhone using Tapatalk Pro

 

 

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