Title: reprocessed entirely after forum feedbacks
Description:
1. the flats were taken with an LED lamp that led to alternations in intensity by each frame which led to weird master flats.
=> using sky flats now
2. I rechecked (and cleaned :-)) the filters: they were in correct order but I
=> corrected naming
3. let the raw data speak:
=> R,G,B channel only with Graxpert and SPCC looks like this
4. adding ContinuumSubtraction Ha into RGBHa using Toolbox script CombineHaWithRGB
5. BlurXterminator, NoiseXTerminator and StarXterminator
6. ArcSinH and HistogramTrafo Stretch
7. Curves Transformation masking the background to avoid amplification of clipped artefacts
8. Screenblend with the RGBH stars
Observations:
- observing data quality on raw RGB and Ha was a great idea
- fixing bad flats and its cause was really a big step (and cleaning is a great idea)
- understanding the additive color scale and the meaning of a magenta tint caused by swapped B and G was ingenious
- very gentle iterations during stretching and curve is key - and also to keep multiple versions for backtracking
- Ha integration must be very subtle to leave space for stretching later on in the red tone
- stretched image needs space for curves adjustment and looks underwhelming or otherwise overcorrects
- processing in bright light provokes to overcorrect - the darker the better
- merging RGB and Ha after stretch was impossible
see forum post with step by step images https://www.astrobin.com/forum/c/astrophotography/deep-sky-processing-techniques/whatever-i-do-i-end-up-with-coarse-details-in-galaxies-where-is-my-process-failing/?page=2#post-156292
Uploaded: ...
Title: reprocessed completely
Description:
new processing flow:
- LinearFit all subs to brightest Blue channel
- HDRCombi of 180s and 300s exposure RGBs
- Ha Continuum Subtraction
- Ha integration into RGB
- SPCC
- BlurX and very little NoiseX
- EZ Softstretch
- HDRMT with 9 layers
- protecting the galaxy faint arms with GAME mask
- gentle CurvesTrafo to enhance contrast and saturation, increasing blue, dimming red
Uploaded: ...
Comments