StarNet2 CLI for Linux - ONNX Runtime Backend
=============================================

StarNet2 removes stars from astronomical images. This package uses the ONNX Runtime
backend and includes the executable, model weights, and package-local runtime libraries together.

Keep ./starnet2, StarNet2_weights.onnx, and lib/ directory together. The
executable uses the bundled weights next to itself by default. Use
--weights only to override the bundled model file.
Do not mix files from different StarNet2 packages.

Output paths are resolved relative to the current working directory unless
absolute.


Quick Start
-----------

Run the executable from the extracted package directory, or invoke it by
path from another working directory:

  ./starnet2 --input input.tif --output starless.tif

By default StarNet2 writes only the starless image. To also write a star
mask, provide a mask filename:

  ./starnet2 --input input.tif --output starless.tif --mask starmask.tif

Optional unscreen star-layer output (disabled unless --unscreen is provided):

  ./starnet2 --input input.tif --output starless.tif --unscreen stars.tif


Options
-------

  -i, --input <file>
      Input image filename. Default: original.jpg.

  -o, --output <file>
      Starless output image filename. Default: starless.jpg.

  -m, --mask <file>
      Optional star mask output filename. Disabled unless provided.

  -n, --unscreen <file>
      Optional unscreen star-layer output filename. Disabled unless provided.

  -w, --weights <file>
      Override the bundled model file. Normally omit this option; the
      executable loads StarNet2_weights.onnx from its package directory.

  -s, --stride <int>
      Tile stride. Default: 256. The value must be even and no larger than
      the 512 pixel processing window.

  -u, --upsample
      Use intermediate 2x upsampling before inference, then downsample outputs.
      This is slower and uses more memory.

  -q, --quiet
      Suppress progress output.

  -e, --eight
      Write TIFF and PNG starless, mask, and unscreen outputs as 8-bit
      instead of the default 16-bit.


Short Option Clustering
-----------------------

Short boolean switches can be combined. For example, -equ is equivalent to
-e -q -u. Only switches without values can be clustered; options that take
values, such as -i, -o, -m, -n, -w, and -s, must be provided separately.


Inputs And Outputs
------------------

Supported input sample depths are 8-bit and 16-bit integer images.
Unsupported input depths, including 32-bit floating-point images, are rejected.
Convert those images to 16-bit integer before running the CLI tool.

Supported inputs are grayscale or RGB/color images. Images with alpha channels
or other channel counts are rejected. Images must be at least 512x512 pixels in
normal mode.

TIFF and PNG starless, mask, and unscreen outputs are written as 16-bit
integer images by default. Use --eight to force 8-bit TIFF/PNG output. Other
output formats are written as 8-bit images.


Legal
-----

See LICENSE.txt for the StarNet2 license. ONNX Runtime license and third-party notices are included with the bundled runtime files.
