Astroart Forum

All sorted now

Sum.

I tried that Iver, but it didn't work, as once stacked, the data that I can recover from a single sub is lost, and I now find that adjusting the image intensity using the scroll, the resulting image view cannot be saved. What I am trying to do, as I always did back in the day, is to layer combine tw...

Can I apply a Histogram Stretch setting to a batch of images, as opposed to applying it to each image individually, and then saving each one before preprocessing (cal, alignment, and stacking etc) to produce a master image with the chosen Histogram Stretch setting? For example, I have a batch of 30 ...

Hi Fabio Thanks for that, it is useful information. The fact that Sum + Sigma will deal with satellite 'streaks' is a very useful feature indeed, as these are a growing problem, year on year. Being slow is not a problem, as being retired, I have all the time in the world. :D I print off all these us...

Hi Fabio

Yes, that does indeed also work.

Is there any preference for one method over the other, or is either method as good as the other?

Dave

Success :) Stacking the light frames using Sigma + Sum, then applying average Darks, removes these "hot Pixel worms" from the final image. I don't profess to understand the mechanism involved, although I'm sure Fabio will, but it works. Whether using Sigma + Sum has any negative impact on the image,...

A bit more info. Aligning and stacking (SUM) the light frames, no dark frame subtraction, then applying the Hot Pixel filter using the Bayer Matrix option (100% strength) to the stacked light frame, reduces the intensity of these "hot pixel worms", but does not remove them completely. Is there an op...

Ok, I have downloaded a 30 day trial version of APP, but having had a quick look, it is a whole new learning curve, and not particularly user friendly. A headache in itself. I thought PixInsIght was bad enough

I'm hoping that I can resolve this issue with AA8, and can continue using it.

I cannot see any trace of them in the individual subs, albeit if they are hot pixels, they would be no more than specks in an individual sub. It is not until they are stacked (SUM) that they become evident, either before, or after dark frame subtraction. The image shown here is aligned, stacked (SUM...

Tried that, but no different.

I might try using Astro Pixel Processor, if there is a demo version available.

Ok, I'll give that a try. I have just been averaging the dark frames. I seem to remember reading somewhere that no form of pre-processing should be applied to these CMOS dark frames. I wonder if that means doing nothing to them, i.e selecting "None" in the option menu, apart from stacking them? Don'...