aquila

Aquila is a fast, terminal-native toolkit for reducing and compositing
astrophotography data on Linux. It is built around a Fortran/C++ core with
OpenMP parallelism and is designed to fit naturally into shell scripts and
automated pipelines.

The package includes three programs:

- aqstack: calibrates and stacks monochromatic CCD frames. Handles bias,
dark, and flat subtraction, hot pixel correction, frame alignment, and
combining by average, median, or sigma-clipped mean.

- aqlrgb: composites multi-filter data into colour images. Supports the
classic LRGB workflow as well as narrowband palette mixing, white-balance
equalisation, background suppression, and nonlinear stretching (asinh,
sqrt, log) before writing FITS or PNG output.

- aqcli: a scripting interpreter for writing end-to-end image processing
pipelines. Scripts load frames, run calibration and stacking routines,
apply convolution kernels and math operations, and save results — all in
a compact, readable domain-specific language.