Search found 235 matches

by Rowland
Sat Apr 07, 2018 7:21 am
Forum: Gallery
Topic: Bode and Cigar RGB
Replies: 4
Views: 5360

Re: Bode and Cigar RGB

Beautiful work...
by Rowland
Sat Dec 16, 2017 8:48 am
Forum: Gallery
Topic: SkyNews Photo of the Week
Replies: 2
Views: 3714

Re: SkyNews Photo of the Week

Superb Hondo. Magnificent. Excellent work.
by Rowland
Wed Nov 22, 2017 8:15 pm
Forum: General Discussion
Topic: What type of file am I using?
Replies: 1
Views: 3171

Re: What type of file am I using?

Linear and deBayered is the correct choice, assuming no other process has been applied to the stacked image.
by Rowland
Wed Nov 15, 2017 9:31 pm
Forum: General Discussion
Topic: reverting one stage during 'wipe'
Replies: 1
Views: 3223

Re: reverting one stage during 'wipe'

Hi Lawrence. You should be able to select any option, Gradient Vignetting etc., and see changes in the sliders below. Of course, nothing happens unless 'Do' is selected, to render a new preview. If 'nothing' changes when you select options from the top row then it is perhaps a bug. No doubt you have...
by Rowland
Fri Nov 10, 2017 8:50 pm
Forum: General Discussion
Topic: Channel separating script Mac and Linux
Replies: 3
Views: 4504

Re: Channel separating script Mac and Linux

Guy. I have been reading your excellent and comprehensive user notes. They are worth their weight in gold. Thank you. ----------------------------------------------- Here is an improved version of the script for use with most image formats. However, I am investigating why imagemagick is not reading ...
by Rowland
Wed Nov 08, 2017 8:30 am
Forum: General Discussion
Topic: astro pixel processor
Replies: 24
Views: 27089

Re: astro pixel processor

The results are in. There's not a huge difference in appearance between the RGB at 275% and the LRGB at 400%, saturation. M31stRGB.jpg M31stLRGB400.jpg Total noise = SquareRoot of Read^2 + Dark^2 Noise analysis - referring to the sumOfsquares, indicates less noise in the LRGB at 400% saturation M31R...
by Rowland
Tue Nov 07, 2017 9:32 am
Forum: General Discussion
Topic: astro pixel processor
Replies: 24
Views: 27089

Re: astro pixel processor

Hi Michele. Interesting comparison. The LRGB technique is intended to provide more control over saturation and not necessarily a guarantee of less noise. The 5 Pixel RGB blur seemed appropriate for the Veil rather than a fixed technique. As it turns out, your 'best' has less noise than the LRGB. All...
by Rowland
Sat Nov 04, 2017 8:14 pm
Forum: Gallery
Topic: Horsehead Nebula
Replies: 6
Views: 5953

Re: Horsehead Nebula

I'm sure that one of the more advanced ST users could do a better job of post processing. Hopefully, this is helpful and a starting point... First up, is a very basic approach to get a look at what's going on in the image. The idea being, that if the image bounces off the screen, cleanly, with just ...
by Rowland
Fri Nov 03, 2017 11:47 am
Forum: Gallery
Topic: Horsehead Nebula
Replies: 6
Views: 5953

Re: Horsehead Nebula

At this stage it's good to see the noise, as it tells us a lot about the image. We may need to change our preprocessing workflow to improve noise reduction or change our imaging parameters. Longer exposure for instance.
by Rowland
Thu Nov 02, 2017 8:37 pm
Forum: Gallery
Topic: Horsehead Nebula
Replies: 6
Views: 5953

Re: Horsehead Nebula

With that amount of data the image should blaze a hole in your screen and look fantastic. Just my opinion, but leave out the first night for now. Take some flats for the second night and do the preprocessing again. As it is, the image looks like it hasn't been wiped or stretched? Tip: at first, don'...