This guide shows a few different ways to measure and visualize contours of images.

Using Plots

The most basic way to create a contour plot is simply to use Plots.jl contour and contourf functions on your image.

Let's see how that works:

using AstroImages, Plots

# First load a FITS file of interest
fname = download(

herca = load("herca-radio.fits")

Create a contour plot