diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index 69cf75b96..33700518e 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -361,18 +361,21 @@ async function getScaleAdjustRegionSample(params: {
   sourceHeight: number;
   region: CanvasLocalEditCompositeRegion;
 }) {
+  const normalizedBuffer = await sharp(params.buffer, { failOn: "none" })
+    .rotate()
+    .resize(params.sourceWidth, params.sourceHeight, {
+      fit: "cover",
+      position: "center",
+    })
+    .png({ compressionLevel: 6 })
+    .toBuffer();
   const box = rectToPixelBox({
     region: params.region,
     width: params.sourceWidth,
     height: params.sourceHeight,
   });
 
-  return sharp(params.buffer, { failOn: "none" })
-    .rotate()
-    .resize(params.sourceWidth, params.sourceHeight, {
-      fit: "cover",
-      position: "center",
-    })
+  return sharp(normalizedBuffer, { failOn: "none" })
     .extract(box)
     .resize(SCALE_ADJUST_DIFF_SAMPLE_SIZE, SCALE_ADJUST_DIFF_SAMPLE_SIZE, {
       fit: "fill",