$ astconvertt [OPTION...] InputFile [InputFile2] ... [InputFile4]

## Convert an image in FITS to PDF:
$ astconvertt image.fits --output=pdf

## Similar to before, but use the Viridis color map:
$ astconvertt image.fits --colormap=viridis --output=pdf

## Add markers to to highlight parts of the image
## ('marks.fits' is a table containing coordinates)
$ astconvertt image.fits --marks=marks.fits --output=pdf

## Convert an image in JPEG to FITS (with multiple extensions
## if it has color):
$ astconvertt image.jpg -oimage.fits

## Use three 2D arrays to create an RGB JPEG output (two are
## plain-text, the third is FITS, but all have the same size).
$ astconvertt f1.txt f2.txt f3.fits -o.jpg

## Use two images and one blank for an RGB EPS output:
$ astconvertt M31_r.fits M31_g.fits blank -oeps

## Directly pass input from output of another program through Standard
## input (not a file).
$ cat 2darray.txt | astconvertt -oimg.fits