From 0add599427b5c5caa8ea25cb86046134c888f973 Mon Sep 17 00:00:00 2001
From: 134 <a134@134deMacBook-Pro.local>
Date: Wed, 8 Jul 2026 00:55:36 +0800
Subject: [PATCH] fix: use alpha channel for product lock repair mask

---
 lib/canvas/generate-image.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index fe8b00185..4e28a8204 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -3361,8 +3361,8 @@ async function applyScaleAdjustProductLockCompositeToImages(params: {
         ? await applyRawAlphaToImage({
             alphaMaskRaw: await sharp(repairMaskBuffer, { failOn: "none" })
               .resize(generatedWidth, generatedHeight, { fit: "fill" })
-              .removeAlpha()
-              .extractChannel(0)
+              .ensureAlpha()
+              .extractChannel(3)
               .blur(Math.max(4, Math.round(Math.min(generatedWidth, generatedHeight) * 0.006)))
               .raw()
               .toBuffer(),