This is about 75 minutes of exposure on Messier 57 – the Ring Nebula. I captured this image using a large number of Slooh.com reservations over several weeks. I optimized SNR by imaging when...
Generating Starless Images Using StarNet++
Creating starless images is useful for a variety of reasons including making it possible to process just the subject of an image independently from the stars in the image. While there are several techniques...
Slooh Review
I wrote a whole book about Slooh.com but it dawned on me that I never actually describe Slooh and how it works for people that have not read the book. This article discusses what...
Adding Luminance Images to SAOImage DS9-Processed RGB Images
In the tutorial Creating An RGB Image Using SAOImage DS9 I showed you how to create an RGB image from three input files (one for each color). The problem is that many observations include...
Creating An RGB Image Using SAOImage DS9
SAOImage DS9 is a FITS file viewing and manipulation application from the Chandra X-ray Science Center (CXC) and the High Energy Astrophysics Science Archive Center (HEASARC). SAOImage DS9 is used for various analysis of...
Selecting Stars In Your Image And Editing Them
A common problem in astronomical image processing is dealing with stars. Sometimes you need to adjust the stars in your image separately from your image’s subject and it would be useful to select only...
Protected: Differences between processing approaches
There is no excerpt because this is a protected post.
Remove A Soft Color Gradient From Your Images
In another article, called Removing the Color Gradient From Your Images, I showed you how to remove the color gradient from your images. Sometimes the effect produced by that process is too strong –...
Removing Color Gradient From Your Images
A color gradient is an effect that covers your whole image and can ruin an otherwise good image. Gradients can come from various sources but the most common is light pollution caused by external...
Using FITS Liberator To Create An RGB Image
I have been showing you how to process images completely online using tools like JS9-4L by the MicroObservatory, JS9 by the Smithsonian and available at Slooh.com for its members, and Photopea – the free...
