Roger’s further processing of my M101 image from last night

I often get a similar effect (green images) with the PD when I am doing an extreme stretch. I put it down to a cheap camera! I reduce it by stretching the luminance only and then trim it using “curves” on the individual colours. However, the GIMP light pollution routine you posted does a pretty good job. What do you think of this? I simply used repair or clone on the main galaxy despeckled layer before setting its mode to subtract.

Process used in detail:

  1. Duplicate image
  2. Despeckle top layer – set radius to max, black to 0 white to max uncheck recursive and adaptive.
  3. Despeckle layer now has blob over M101. Get rid of it using clone or repair
  4. Set mode of despeckle layer to subtract
  5. Merge down
  6. QED

Roger

Update on reorganisation of log cabin/observatory

Looks much better now. Do need to fit in dismantled HEQ5 Pro and EQ6 Pro on its new mobile base but otherwise this will be as it will (hopefully) continue to be!

Marquee now close to empty – red telescope is for sale. Large pile in corner is all going too.

For some reason today, WordPress insists on putting two of the images upside down, whatever I do!

Andy

M101 from Lichfield 29/9/2019

Unexpectedly, the sky cleared for a couple of hours tonight and I whizzed outside to take another picture of M101 – this time trying to use everything I have learnt so far, in order to see whether I could improve on my previous image taken early in my astrophotography journey.

Photo taken using QHY10 single shot colour astro camera on Sky Watcher Equinox 80mm Pro OTA, mounted on Sky Watcher HEQ5 Pro mount.

Most of processing done in Nebulosity 4 software (the Digital Development function and synthetic flat field were used – even though I also used flat frames I have previously taken – makes me wonder if my setup has moved since flat frames taken as synthetic flat frame did help when I processed this image), and some tweaking in GIMP.

I am happy with amount of detail, including some tiny galaxies evident on the image.

Andy

Guides on how to process deep sky images in Nebulosity 4 & GIMP softwarefrom QHY10 camera (and other cameras)

Below are links to imaging guides I have written/found useful based on what I have learnt over the last 8 weeks. The files are in no particular order.

Andy

Craig Stark Pre-processing in Nebulosity accessed 050919

Extended batch processing of images in Nebulosity (Damian) 250919

How to preprocess in Nebulosity 4

How to process dark frames in Nebulosity Damian 080919

How to remove light pollution from astronomy photograph in GIMP 250819

How to stack frames in Nebulosity 4 (without darks) Damian 310819

How to take flat frames on QHY10 250919

How to work out offset and gain QHY10 Craig Stark – summary of procedure

How to work out offset and gain QHY10 Craig Stark

Instructions on how to take dark frames from Damian 030919

Light dark flat and bias frames – what are they – deepskystacker – accessed 220919

Process for processing image in GIMP developed with Damian 250919

Sorting out elongated star images (star trailing) in astrophotos 270819

What is a Bias Frame

New version of my NGC 7000 image – processed by myself under supervision/direction of Damian 25/9/2019

The picture below was processed by myself 25/9/2019 under the direction and supervision of Damian using my own data that I have described previously. When Damian previously processed this data, he used Photoshop and a synthetic flat frame. However, this time around we took a set of flat frames at -10 C for 4 seconds each and incorporated this in the Nebulosity 4 software initial processing of the subs. All subsequent processing was done in GIMP.

Andy