colorway-variants.py: add --detect (two dominant tones) + --list-presets CLI modes for the preset-colorway endpoint

231021ed60e28ca025a265bc139c47a32f9ba525 · 2026-06-12 07:43:15 -0700 · Steve Abrams

Files touched

M scripts/colorway-variants.py

Diff

commit 231021ed60e28ca025a265bc139c47a32f9ba525
Author: Steve Abrams <steve@designerwallcoverings.com>
Date:   Fri Jun 12 07:43:15 2026 -0700

    colorway-variants.py: add --detect (two dominant tones) + --list-presets CLI modes for the preset-colorway endpoint
---
 scripts/colorway-variants.py | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/scripts/colorway-variants.py b/scripts/colorway-variants.py
index 023642e..32c974d 100755
--- a/scripts/colorway-variants.py
+++ b/scripts/colorway-variants.py
@@ -87,9 +87,36 @@ def recolor(im, src_ground_rgb, src_figure_rgb, dst_ground_rgb, dst_figure_rgb):
     return out
 
 
+def rgb_to_hex(rgb):
+    return "#%02x%02x%02x" % (int(rgb[0]), int(rgb[1]), int(rgb[2]))
+
+
 def main():
+    # --list-presets: dump COLORWAY_PAIRS as JSON (UI builds chips from this so
+    # the preset list lives in ONE place, not duplicated in server.js).
+    if len(sys.argv) >= 2 and sys.argv[1] == "--list-presets":
+        print(json.dumps({"ok": True, "presets": [
+            {"slug": s, "ground": g, "figure": f} for (s, g, f) in COLORWAY_PAIRS
+        ]}))
+        return
+    # --detect <input.png>: print the two dominant tones (ground=most-common,
+    # figure=less-common) as hex. The colorway-preset endpoint uses these as the
+    # ink_map `from` colors, then maps them to a preset's (ground,figure) `to`.
+    if len(sys.argv) >= 3 and sys.argv[1] == "--detect":
+        src_path = sys.argv[2]
+        if not os.path.exists(src_path):
+            print(json.dumps({"ok": False, "error": "file not found: %s" % src_path}))
+            sys.exit(2)
+        im = Image.open(src_path).convert("RGB")
+        two = detect_two_tones(im)
+        print(json.dumps({
+            "ok": True,
+            "ground_hex": rgb_to_hex(two[0][0]),
+            "figure_hex": rgb_to_hex(two[1][0]),
+        }))
+        return
     if len(sys.argv) < 2:
-        print("usage: colorway-variants.py <input.png>", file=sys.stderr)
+        print("usage: colorway-variants.py <input.png> | --detect <input.png> | --list-presets", file=sys.stderr)
         sys.exit(1)
     src_path = sys.argv[1]
     if not os.path.exists(src_path):

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