Back to forums

Tell us your Gimp secrets

Processing Noise Reduction
Gimp Processing •7 replies•91 views
dsurfingmark avatar
dsurfingmark avatar
If anyone has any secrets as to how to process in Gimp, put them here!

I'll start: G'MIC is a great add on for Gimp. Iaian's noise reduction and Iaian's fast noise reduction are great.
Engaging
David Moulton avatar
David Moulton avatar
G'MIC is a great add on for Gimp. Iaian's noise reduction and Iaian's fast noise reduction are great.


Thanks for this! It's made a huge difference in my processing.
Well Written Respectful
David Moulton avatar
David Moulton avatar
The background desaturation portion of this video was very helpful to me. As was the portion about removing dust. The Gimp part starts around 17:45. The beginning is Siril, which is very helpful if you are using that software.

Siril and Gimp
fduguay avatar
fduguay avatar
I'll start: G'MIC is a great add on for Gimp. Iaian's noise reduction and Iaian's fast noise reduction are great.

I have only used Photocomix  smoothing but willing to try Iaian's .  What are some of the advantages?
Dale Penkala avatar
Dale Penkala avatar
Gimp gets a bad rap for processing and I makes me miffed that people say to get rid of it. GMic’s Iain’s noise reduction 2019 is a great tool in Gimp, along with the wavelets option. Another plug-in I find very useful is the PyAstro with its “smart sharpen” function! https://stargazy.weebly.com/pyastro-for-gimp.html
Star reduction that is a great tool using the Pick by color tool/Grow/Feather/Filter/Value Propagate. You just have to get familiar with the process and technique.

Dale
fduguay avatar
fduguay avatar
Dale Penkala:
Gimp gets a bad rap for processing and I makes me miffed that people say to get rid of it. GMic’s Iain’s noise reduction 2019 is a great tool in Gimp, along with the wavelets option. Another plug-in I find very useful is the PyAstro with its “smart sharpen” function! https://stargazy.weebly.com/pyastro-for-gimp.html
Star reduction that is a great tool using the Pick by color tool/Grow/Feather/Filter/Value Propagate. You just have to get familiar with the process and technique.

Dale

Totally agree with you Dale. The star reduction works really well in GIMP.  Will give PyAstro a try.  Thanks for the tip.
fduguay avatar
fduguay avatar
I have a question about combining data from different filters ( i.e. broadband filter and dual narrow band filter). How do you bring out the different colours from each of the images? I just copy one of the images as a new layer and play with the opacity. However this means that each of the images will lose some data.  Should I flatten the combined image and continue processing with curves and saturation? Thanks
Dale Penkala avatar
Dale Penkala avatar
I have a question about combining data from different filters ( i.e. broadband filter and dual narrow band filter). How do you bring out the different colours from each of the images? I just copy one of the images as a new layer and play with the opacity. However this means that each of the images will lose some data.  Should I flatten the combined image and continue processing with curves and saturation? Thanks

I do all post processing in Gimp/StarNet/Topaz DeNoise. APP or Astro Pixel Processor is what I use to process and combine the data. Once I do that all the other post processing is in StarNet & Topaz DeNoise and all the layers are combine in Gimp. Its a powerful software once you get used to it. 
For my layers I use different modes like, Subtract, Screen and Normal modes.

Dale