From the April 2015 issue

Maximize a minimum filter

Astroimager Adam Block describes how to use a minimum filter to de-emphasize stars and dramatically enhance astronomical images.
By | Published: April 27, 2015 | Last updated on May 18, 2023

Faint to medium-bright stars in an image can be a distraction, making it difficult to appreciate a nebula or galaxy. Using a minimum or erosion filter is a wonderful way to de-emphasize star-crowded fields and thereby dramatically enhance your image.

Astronomy magazine subscribers can read the full column for free. Just make sure you’re registered with the website.