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So here's an image that surely does not deserve to see the light of day - but it comes with a story related to my quest to someday properly use bayer drizzle. Last year I shot M42 at super-low gain, but it was when I had not yet sorted out the quirks of my AT130. So some subs were shot with the wide...

M1_OSC_430x90s_2.5sec_rgb_tight-crop_svd-1st_bin71.jpg 430x90s HCG (10hr 45m), AT130EDT, Risingcam IMX571c I collected more like 15 hours, but there was this nice stretch of quite good seeing so I culled it down to stack only the subs with better than 2.5" FWHM. I also tried ~7hrs of subs with <2.2...

As you're discussing the colors of the Flame, I figured I look back at my own from last winter. Your Flame is decidedly more red - maybe a lot more saturated? B33_ST_Flame-ROI_nb-accents.jpg That is OSC + duoband for NB Accents. I'd have to do some digging to see if I have notes on exactly how I pro...

Croman did reply again to say: BXT was trained to perform deconvolution on linear data with stars present to infer the PSF*, and with no noise reduction applied prior to its use. What it does to nonlinear data, or data without stars, or data that has been noise-reduced by who knows what method, is a...

Very interesting. I *think* the only reason to try to match flat color to LP color is *if* you are in the situation Mark described, where your sensor is not completely linear at the ADU values of background regions in your lights *and* you are taking flats at those same ADU levels. Otherwise I think...

Everyone should have a nice horseyhead! I don't think I will re-shoot it myself this year, but we'll see. Mine from last year was in the early days with my AT130, before I sorted out the light leaks. I had a similar rouge diffraction spike with my RC6. An out-of-frame Phecda drove me nuts looking fo...

But as Mark says, the less gradient extraction needed, generally the better. And that's one reason I got WBPP to start utilizing subframe weighting and local normalization due to the many changing LP gradients I have when I do an imaging sweep. Separate question - does applying local normalization ...

Yes - the idea is to have your flats match the average ADU of your lights. I simply loaded a bias-subtracted light into Siril and took the per-channel statistics Siril reported as correct. The implementation was completely trial and error. I think for a dslr Raw you might already have some weights f...

BXT 2.0 turns every flawed imaging train into perfection - producing perfect round stars out of almost anything. Actually, my real point in posting today is that Croman has put up a description of the math that BXT is attempting: https://www.rc-astro.com/the-mathematics-of-blurxterminator/ Not so us...

A few months ago a post by CN user Mark Shelley (aka sharkmelley) caught my eye. His observation is that some color gradients, especially circular or at the borders, can be due to two factors: 1) imperfect sensor linearity at the very low ADU values that typify most astro images; 2) crosstalk betwee...