Official StarTools support forum

Thanks for pushing the conversation. The first step is that I'm not clear about is the word "local". Does local mean that HDR, for example, changes the stretch curve so that it is different at different coordinates within the image? That would be akin to a "masked stretch", right? Or, does local mea...

Somewhere I remember reading that, for CFA drizzle, one ought to dither every frame. (apparently I'm not the only one who recalls reading that https://www.cloudynights.com/topic/907844-m46m47-and-my-drizzlebxt-test/?p=13212611 ). But yeah, maybe that truism was not anticipating 15s subs. I have swit...

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...