optical FITS, NAXIS = 2, dimensions 24900 x 26620, 2.5GB FITS file, the following code runs out of memory:

using AstroImages
#] pkg> add https://github.com/JuliaAstro/AstroImages.jl

using FITSIO
using Plots

dir = "/home/chris/ダウンロード"
file = "e20121211_0010500001_dp_sf_st_mos.fits"

fitspath = string(dir, "/", file)
println("loading ", fitspath)
fits = load(fitspath)

img = AstroImage(fits)
plot(img)

The FITS file can be downloaded from

http://surveys.roe.ac.uk/wsa/cgi-bin/siap.cgi?extNum=2&file=djoser:/disk39/wsa/products/mosaics/20121211_v10/e20121211_0010500001_dp_sf_st_mos.fit

Then the file extension needs to be changed from .fit to .fits .