# Hydra OS mark

`hydra-mark.png` is the original transparent image generated with the built-in
imagegen tool. The complete prompt and conversion settings are in
[`generation.json`](generation.json). `preview.png` shows the resulting ASCII
glyphs; the shipped asset is `image/rootfs/usr/share/hydra/fastfetch.txt`.

The 44-column mark uses ordinary ASCII characters, cyan Fastfetch color `$1`,
and a white `$2` caption. Pillow is needed only to regenerate the text, not to
run Fastfetch or build an image with the checked-in asset.

From the repository root, with Python and Pillow available:

```sh
python3 dev/render-logo.py
fastfetch --config image/rootfs/etc/fastfetch/config.jsonc \
  --logo image/rootfs/usr/share/hydra/fastfetch.txt --pipe false
```

On a Nix development host, the converter can also run in a temporary environment:

```sh
nix-shell -p 'python3.withPackages (p: [p.pillow])' \
  --run 'python3 dev/render-logo.py'
```

The converter uses opacity to preserve the single-color silhouette, removes
faint alpha noise, and accounts for terminal character proportions. It preserves
the PNG source. Future ISO builds and runtime update bundles include the new text;
previously built ISOs and installed guests retain their existing logo.