Add revpals.py and fix dupeframes.py

tools/dupeframes.py

@@ -27,8 +27,8 @@ def main():
 	if len(sys.argv) != 2:
 		print(f'Usage: {sys.argv[0]} path/to/gfx/pokemon/', file=sys.stderr)
 		sys.exit(1)
-	for filename in sorted(glob.glob(f'{sys.argv[1]}/**/*.png')):
-		name = filename.removeprefix(sys.argv[1] + '/')
+	for filename in sorted(glob.glob(f'{sys.argv[1]}/**/*.png', recursive=True)):
+		name = filename.removeprefix(sys.argv[1]).removeprefix('/')
 		for (i, j) in duplicate_frames(filename):
 			print(f'{name}: frame {j} is a duplicate of frame {i}', file=sys.stderr)
 

tools/revpals.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Usage: python3 revpals.py path/to/gfx/
+
+List Pokemon and trainer sprites with reversed palettes (darker color first).
+"""
+
+import sys
+import glob
+
+import png
+
+def luminance(c):
+	r, g, b = c
+	return 0.299 * r**2 + 0.587 * g**2 + 0.114 * b**2
+
+def is_reversed(filename):
+	with open(filename, 'rb') as file:
+		reader = png.Reader(file)
+		reader.preamble()
+		try:
+			palette = [c[:3] for c in reader.palette()]
+		except:
+			return False
+	if len(palette) != 4 or palette[0] != (255, 255, 255) or palette[3] != (0, 0, 0):
+		return False
+	return luminance(palette[1]) < luminance(palette[2])
+
+def main():
+	if len(sys.argv) != 2:
+		print(f'Usage: {sys.argv[0]} path/to/gfx/', file=sys.stderr)
+		sys.exit(1)
+	for filename in sorted(glob.glob(f'{sys.argv[1]}/**/*.png', recursive=True)):
+		name = filename.removeprefix(sys.argv[1]).removeprefix('/')
+		if is_reversed(filename):
+			print(name, file=sys.stderr)
+
+if __name__ == '__main__':
+	main()