Thanks. 5x? Wow. So that's still adding useful desired signal and not blowing it out with LP?
I guess my blue peak only went up about 1/16 histogram when I look at things again, but on-screen it was starting to seem pretty bright and the galaxy shape was hazing over. I've used far far worse, of course (I'm a beginner!), but I'd kind of like to make this a nice one and I haven't worked anything out yet for keep/reject on skyglow.
Thanks. I may have been overreacting, though still wondering what reasonable "range from optimum" I should be thinking about.
And gracias, I guess it is my birthday...in UTC. The fourth with me be not.
My brother sent me the Bracken book. Of course I knew it all already, just from being here on CN.
Flipping through the PI sections made my eyes bug out. I can't believe you guys are doing all that work!
What I do. Bortle 7. Close to a big city.
Don't image below 45 degrees elevation.
Don't try to image galaxies and nebulae when the Moon is anywhere near the target.
Brightness variations are not a problem.
Bracken's PI processing is kiddy stuff. <smile>
Here's an adult.
And here's a serious pro. The best noise reduction technique I've ever seen, and I've seen a lot.
Illustrative _small_ quote from the above.
"Now here is the critical part about creating a good TGV mask. It needs to be low contrast. We want to have higher protection in brighter areas than in darker areas, however it is critical that darker areas are actually protected fairly heavily. This is where manual masking for TGV differs from normal use…we are applying strong protection, and therefor significant attenuation, of the TGV denoising effect to the darker areas. It’s increased protection is what preserves detail and fine grain, while still allowing significant NR. To modify the mask, you need to perform two steps. First, open CurvesTransformation and reset it. Adjust the black point Output level to somewhere between 0.15 and 0.25, for now start with 0.2. Adjust the white point Output level to somewhere between 0.5 and 0.65, for now start with 0.5. Apply CT to your TGV_mask image.
This will brighten the dark parts and darken the light parts, resulting in a lower contrast gray image. We’ve started with 0.2 and 0.5, however in general you will want to tweak these levels depending on the initial contrast of your data…higher contrast data could use more tuning, while lower contrast data could use less tuning."
The first time I used the techniques, I took maybe 4 hours. I've got it down to an hour. Most of the time.
It takes me 10 (simple black and white H alpha) to 50 (multiple filters, both broad and narrowband) hours to process an image. In my best year, I did 17 (seventeen).
The thing about PI. It does not magically process better. It provides you a vast array of extremely adjustable tools so that YOU can process better. It's truthfully said that, if there are two ways to do something, PI has five. To get the most out of PI, you have to know which of the five to use when. <smile> And how to use them, what parameters to adjust how.
I generally use a combination of at least three stretching techniques. Now you have to know in what order to do them. It varies with the data.
Why I recommend Astro Pixel Processor to beginners. They have more important things to do than to learn to use PI well.
Edited by bobzeq25, 04 May 2021 - 10:52 PM.