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Published byBrady Godel Modified over 9 years ago
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Discovered in August, 2014 by Terry Lovejoy Was closest to Earth on January 7, ~4 th mag Periodic comet, next visit in 8000 years Now in Taurus, headed for Andromeda Gerald Rhemann, 12” f/3.6, Namibia
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Different rates create problems With star tracks Align on comet, not stars… special routine Combine in usual way without removing outliers Jerry Lodriguss
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Without star tracks Align on comet (image 1) Align on stars (image 2) Combine using sigma clipping
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Comet image with stars removed by sigma clipping
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Combine star and comet image… the tricky part Harry Page method using PixInsight Some background on PixInsight First, a disclaimer “Cutting edge image processing and analysis tools for a broad range of technical imaging applications” Basically an image processing toolbox with over 80 tools
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From Pleiades Astrophoto, S.L., Valencia, Spain Not a “paint” program, big difference from PS Available for PC, MAC, Linux, etc $270 USD; all updates included; no refunds, but 45-day trial Is it hard to learn? NOT intuitive and very little written documentation Similar to PS in this way… steep learning curve, but doable
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Warren Keller videos, 3 now available, $65 Harry Page’s (UK) videos Free www.harrysastroshed.com www.harrysastroshed.com Lightvortex Astronomy, Kayron Mercieca Well written workflows, including DSLR Great for doing those first images Gibraltar Astronomical Society website Drake Visual… extensive list of resources Bottom line… doable and worthwhile
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Is PixInsight a substitute for Photoshop? No, IMHO they are complementary Strengths of Photoshop… focused editing (“painting”) Layers and masks Curves and levels Cloning and painting Camera Raw noise reduction Carboni Tools and other plugins Is PixInsight a substitute for CCDStack, Images Plus, DSS, Nebulosity, Registar, etc? Yes
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Strengths of PixInsight ScreenTransferFunction
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DynamicBackgroundExtraction (DBE) and ABE
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HistogramTransformation
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CurvesTransformation
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Other tools I find useful Aligning and combining… may replace Registar DynamicCrop MaskedStretch PixelMath RangeSelection ColorSaturation LinearFit Various noise reduction tools Wavelets direct noise reduction In my experience, overly smoothing
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Step 1… generation of star image
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Step 2… generation of comet image
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Step 3… generate star mask from star image
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Step 4… LinearFit to even out background Step 5… Add star image to comet image (with star mask)
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Step 6… Process combined image in PixInsight and Photoshop
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