# Alien ships

Source: `assets/Ships/alien_ship.jpg` (40 ships, 8 columns × 5 rows).
`atlas.png` was prepared with the built-in ImageGen editor. Designs are adapted
from the original sheet; ImageGen may redraw small details.

Prompt: Remove the gray checkerboard and replace it with real transparent alpha;
preserve all 40 dark alien ship designs, red/magenta colors, original ordering,
and crisp silhouettes. Arrange exactly 8 columns × 5 rows with isolated craft,
transparent margins, no text, no shadows, no background. Face ships upward.

`extract_sprites.ps1` slices the returned atlas, trims transparent margins,
corrects remaining sideways/downward orientations, and centers each sprite
on a transparent 256 × 256 canvas with a maximum occupied dimension of 224.
Run this PowerShell script to rebuild `alien_01.png` through `alien_40.png`.

The catalog in `scripts/items/alien_ship_catalog.gd` is shared by the level
generator and game. Each system selects one design using its level and seed.
All enemy tiers use that design; elites retain their tint and bosses their size.