This guide shows a few different ways to measure and visualize contours of images.
The most basic way to create a contour plot is simply to use Plots.jl
contourf functions on your image.
Let's see how that works:
using AstroImages, Plots # First load a FITS file of interest fname = download( "http://www.astro.uvic.ca/~wthompson/astroimages/fits/herca/herca_radio.fits", "herca-radio.fits" ) herca = load("herca-radio.fits")
Create a contour plot