sharper earth map

scripts/gallery-delta.py

@@ -46,8 +46,8 @@ OUT = ROOT / "gallery" / "delta"
 TIERS = ["L0", "L1"]
 CAMERA = "C1"
 # Renders at once. Each loads its own copy of the Earth and Moon maps; four at once ran
-# the RTX 3060 (12 GB) out of memory.
-WORKERS = 2
+# the RTX 3060 (12 GB) out of memory, and with a sharp Earth map (4.9 GB) two do.
+WORKERS = 1 if any((ROOT / "data" / "earth").glob("sharp-*.tiles")) else 2
 BRIGHTER = np.array([255, 150, 40], dtype=float)
 DARKER = np.array([60, 140, 255], dtype=float)