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Ptolemy's cluster

(PID:51298548154) Source
posted by Stille alias -stille- on Thursday 8th of July 2021 09:04:58 AM

1 stack of 35 60s images, Canon 800D at ISO 800, Canon 400mm f5.6 lens at f6.3, iOptron Skyguider Pro tracker. 50 darks, 120 biases. Processed in PixInsight as below ***** Integration lightvortexastronomy tutorial (www.lightvortexastronomy.com/tutorial-pre-processing-cali...) * CC defect list + master dark (sigma = 8) 15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin)) + 35*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin)) + 20*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin) + 30 img 0713 ref * ESD integration * drizzle integration, circular kernel, area containing the galaxies *****Linear processing *** Initial * Crop * DBE tolerance 3, manually placed points outside the dust clouds * CC using a dust cloud as background, background ref upper limit 0.0025 *** Denoise Using jonrista.com/the-astrophotographers-guide/pixinsights/eff... as implemented by EZSuite. * TGV edge protection 5e-5, default MMT ***** Nonlinear processing *** Initial stretch * MaskedStretch * extract luminance, histo stretch shadows 0.06 mids 0.02, use as mask * range mask 0.3, smoothness 9, apply, boost saturation * ACDNR: create star mask (save, will use later), curves boost, dilate x 2 convolve x2, apply to main image. ACDNR on chrominance only, w/ lightness mask, 4 stdev 6 iterations *** Colors * CC with white ref upper limit 1 and background ref upper limit 0.2 * invert, SNCR green 0.8 to fix magenta background hue, invert again * SNCR green 0.8 *** Stars * Using a copy of the star mask, reduce using EZReduce, morphological transformation * extract luminance, curve to get white stars and dark background, use as mask, unsharpmask 0.7 *** Other processing * break down image in starless and stars, erase dust marks from starless, sum starless and stars back to the old image * Duplicate, LHE kernel 512 contrast limit 1.5, slight contrast curve in RGB/K and sat boost, 0.5 blend with original * denoise using jonrista.com/the-astrophotographers-guide/pixinsights/eff... as implemented by EZSuite. TGV edge protection 2e-2, default MMT * MMT sharpen 6 layers biases 0.025 0.5 0.025 0.025 0.012 0.005



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  • Published 06.30.22
  • Resolution 1024x700
  • Image type jpg
  • File Size 332274 byte.

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