diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index e5ac066c7..0a0059076 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -111,7 +111,8 @@ const SCALE_ADJUST_STRUCTURE_LOCK_MIN_MASK_RATIO = 0.006;
 const SCALE_ADJUST_STRUCTURE_LOCK_COMPONENT_MIN_RATIO = 0.00018;
 const SCALE_ADJUST_RMBG_MIN_ALPHA_RATIO = 0.012;
 const SCALE_ADJUST_RMBG_MAX_SOLID_ALPHA_RATIO = 0.92;
-const SCALE_ADJUST_RMBG_ALPHA_CLEAN_THRESHOLD = 42;
+const SCALE_ADJUST_RMBG_ALPHA_CLEAN_THRESHOLD = 96;
+const SCALE_ADJUST_RMBG_ALPHA_MEDIAN_SIZE = 5;
 const MIN_REGION_EDGE_PX = 24;
 const SCALE_ADJUST_OPERATION = "scale-adjust";
 type LocalEditOperation = "local-edit" | typeof SCALE_ADJUST_OPERATION;
@@ -1709,23 +1710,38 @@ function getScaleAdjustAlphaBoundingBox(params: {
   };
 }
 
-function cleanScaleAdjustAlphaChannel(params: {
+async function cleanScaleAdjustAlphaChannel(params: {
+  height: number;
   rawRgba: Buffer;
   threshold?: number;
+  width: number;
 }) {
-  const { rawRgba, threshold = SCALE_ADJUST_RMBG_ALPHA_CLEAN_THRESHOLD } = params;
+  const {
+    height,
+    rawRgba,
+    threshold = SCALE_ADJUST_RMBG_ALPHA_CLEAN_THRESHOLD,
+    width,
+  } = params;
   const pixelCount = Math.floor(rawRgba.length / 4);
+  const initialAlpha = Buffer.alloc(pixelCount);
+  for (let index = 0; index < pixelCount; index += 1) {
+    const sourceAlpha = rawRgba[index * 4 + 3] || 0;
+    initialAlpha[index] = sourceAlpha >= threshold ? 255 : 0;
+  }
+
+  const alphaData = await sharp(initialAlpha, {
+    raw: { channels: 1, height, width },
+  })
+    .median(SCALE_ADJUST_RMBG_ALPHA_MEDIAN_SIZE)
+    .threshold(128)
+    .raw()
+    .toBuffer();
   const cleanedRaw = Buffer.from(rawRgba);
   const cleanedAlpha = Buffer.alloc(pixelCount);
-  const range = Math.max(1, 255 - threshold);
 
   for (let index = 0; index < pixelCount; index += 1) {
     const alphaIndex = index * 4 + 3;
-    const sourceAlpha = rawRgba[alphaIndex] || 0;
-    const nextAlpha =
-      sourceAlpha < threshold
-        ? 0
-        : Math.max(0, Math.min(255, Math.round(((sourceAlpha - threshold) / range) * 255)));
+    const nextAlpha = alphaData[index] >= 128 ? 255 : 0;
     cleanedRaw[alphaIndex] = nextAlpha;
     cleanedAlpha[index] = nextAlpha;
   }
@@ -1807,8 +1823,10 @@ async function buildScaleAdjustRmbgStructureLockedComposite(params: {
       .ensureAlpha()
       .raw()
       .toBuffer();
-    const { cleanedAlpha, cleanedRaw } = cleanScaleAdjustAlphaChannel({
+    const { cleanedAlpha, cleanedRaw } = await cleanScaleAdjustAlphaChannel({
+      height: cutoutHeight,
       rawRgba: cutoutRaw,
+      width: cutoutWidth,
     });
     const cleanedCutout = await sharp(cleanedRaw, {
       raw: { channels: 4, height: cutoutHeight, width: cutoutWidth },