An osu!stable skin rendered from code. Black screen, phosphor green, a terminal font, and an oscilloscope on the main menu. The name is the code for the classic green phosphor in old terminals and scopes.

Every image is drawn by gen.py with Pillow. Change a colour or a stroke width, rerun it, and the whole skin follows.

Download

Grab P1.osk from Releases and open it; osu! imports it. The release includes sounds, see Credits.

Build

Requirements: Python 3, Pillow, fontconfig (fc-match), and Terminess Nerd Font installed system wide.

python3 gen.py out/P1

Copy out/P1 into your osu! Skins folder and pick P1 in Options > Skin.

This builds the visuals only, with no sounds, so osu! uses its default sounds. To pull sounds from skins you already own:

python3 gen.py out/P1 --assets "Skins/Some Skin" --hitsounds "Skins/Other Skin" --osk P1.osk

--assets takes every sound from that skin.
--hitsounds replaces only the gameplay sounds (hit, slider, nightcore, combobreak) with another skin's set. Any matching sound from --assets is removed first, in every extension and numbering, so two sets never mix.
--osk also packs the finished skin into an .osk (a zip of the skin folder).

Rebuild into a fresh folder and replace the old one. Hidden elements are blank @1x files, and a stale @2x left behind by a previous build would win over them.

How it is drawn

4x supersampling. Each element is drawn at four times its @2x size, then downsampled to @2x and @1x. Edges and thin rings come out smooth without a separate antialiasing pass.
White where the game tints. osu! multiplies hit circles, approach circles, the slider ball, input keys and song select cards by a colour at draw time. Those are drawn white or grey so the combo colour shows through unchanged.
Hidden, not missing. Lighting, particles, combo bursts, kiai fountains, the cursor trail and the slider tail circle are 1x1 transparent images. A missing file falls back to the default skin, so hiding takes a file.
Palette. #00ff00 with dim tiers, three combo greens stepped by brightness (0,255,0, 0,165,0, 0,95,0), and #ff5555 for misses only.

Limits of stable skinning

Some things a skin cannot change in osu!stable: the progress pie, the hit error bar colours, leaderboard names, and the colours the game uses for pressed input keys. Slider bodies are a dark neutral because a per combo body renders at full brightness and there is no opacity setting.

License

MIT for everything in this repository. The font is not included; Terminess Nerd Font is under the SIL Open Font License.

Credits

The sounds in the release .osk are not part of this repository and not covered by its license. Menu and interface sounds come from the Beafowl skin (skin.ini author: Garin); gameplay hitsounds come from the Stars in The Sky skin (author not listed). They are included with credit; if you are an author and want them removed, open an issue and they will be.