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A New Approach to Narrowband Processing of NGC 3293
In this webinar, Nik Szymanek demonstrated a comprehensive post-processing workflow using the NGC 3293 Observation Bundle from Telescope Live. Leveraging the capabilities of multiple tools, including PixInsight, Affinity Photo, and the suite of XTerminator plugins (Blur, Star, and Noise XTerminator by RC Astro) Nik showed participants a unique glimpse into his process that frequently yields remarkable results.
The journey begins in PixInsight, where an RGB FITS image is created and subsequently scaled alongside the H-alpha integration. Deconvolution is run using the BlurXTerminator plugin, and after some histogram transformations, the mono and RGB frames are combined into a pseudo 'LRGB' image, an Ha-SHO format that takes advantage of the high signal-to-noise ratio of the H-alpha data, utilizing it as a luminance frame.
The stars are then extracted using StarXTerminator in PixInsight, creating a starless and a star-only version of the image. These are then further enhanced in Affinity Photo, using the Tone Mapping tool on the starless layer and color manipulation via Selective Colour. After noise reduction with NoiseXTerminator, the image is further refined with adjustments such as sharpening and scaling.
Generalized Hyperbolic Stretch - An Improved Way to Stretch Your Images in Pixinsight
Generalized Hyperbolic Stretch or GHS is a Pixinsight script designed to give you a new and improved approach to stretching your astrophotography images in Pixinsight. Adam Block will cover installing the script & module, the basics of the interface, the core principles of GHS, and the several use cases for this script.
To install GHS, follow the instructions below:
1) From within Pixinsight, go to: Resources > Updates > Manage Repositories
2) In the Manage Update Repositories dialog, click the Add button
3) In the URL box, type the GHS repository information as follows: https://www.ghsastro.co.uk/updates/
4) In the Add Pixinsight Repository dialog, click the OK button
5) In the Manage Update Repositories dialog, click the OK button
HOW TO PROCESS NARROWBAND EMISSION NEBULAE IN PIXINSIGHT
In this 6 part series, Warren will show you how to post-process a narrowband emission nebula using Pixinsight. Each part of this series will cover the following techniques, all of which can then be applied to other emission nebulae captured in narrowband
Part-1 - Channel combination, framing and deconvolution
ChannelCombination
DynamicCrop
BlurXTerminator (deconvolution)
Part-2 - Noise reduction and delinearisation
NoiseXTerminator (noise reduction)
HistogramTransformation (delinearize)
StarXTerminator (star removal)
SCNR (eliminate green from stars)
Part-3 - Nebula masking and Colour Adjustments
HistogramTransformation (raise black point)
GAME Script (nebula mask)
Convolution (mask feathering)
CurvesTransformation (saturate and brighten)
CurvesTransformation (hue experiment)
Part-4 - Contrast and Sharpness
LocalHistogramEqualization (contrast)
MultiscaleMedianTransformation m(sharpness)
Save Project
Part-5 - Advanced masking techniques and colour refinement
ColorMask v.1.0 mod 4 (masks by color range)
CurvesTransformation (alter hue)
Part-6 - Finishing touches
DarkStructureEnhance Script
CurvesTransformation (background saturation)
PixelMath (rescreen stars)
HOO Palette (Ha-OIII-OIII)
Ancient Echoes of a Forgotten Sky
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Ancient Echoes of a Forgotten Sky
In this talk given by Adam Block, he will discuss how we portray astrophotography images and how our choices of field of view, resolution, and color affect how we process and publish our astronomical images. Adam will also discuss the theory of natural beauty, how we interpret beauty in both landscape and astrophotography, and where these preferences come from.