diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index faed4c1c0..497b972e1 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -77,11 +77,18 @@ type NormalizedLocalEditRegion = {
 
 const MAX_LOCAL_EDIT_REGIONS = 8;
 const MAX_REFERENCE_IMAGES_PER_REGION = 3;
+const MAX_SCALE_ADJUST_CROP_REFERENCES = 4;
+const SCALE_ADJUST_CROP_PADDING_RATIO = 0.18;
+const SCALE_ADJUST_CROP_MAX_EDGE = 1536;
 const MIN_REGION_EDGE_PX = 24;
 const SCALE_ADJUST_OPERATION = "scale-adjust";
 type LocalEditOperation = "local-edit" | typeof SCALE_ADJUST_OPERATION;
 const SCALE_ADJUST_PERCENT_OPTIONS = [-30, -20, -10, 10, 20, 30] as const;
 type ScaleAdjustPercent = (typeof SCALE_ADJUST_PERCENT_OPTIONS)[number];
+type ScaleAdjustCropReference = {
+  regionIndex: number;
+  url: string;
+};
 const DEFAULT_REGION_COLORS = [
   "#ff3b30",
   "#1677ff",
@@ -316,6 +323,75 @@ function scaleRectAroundCenter(
   };
 }
 
+function expandPixelRectForCrop(params: {
+  height: number;
+  pixelRect: NormalizedLocalEditRegion["pixelRect"];
+  width: number;
+}) {
+  const { height, pixelRect, width } = params;
+  const padX = Math.round(pixelRect.width * SCALE_ADJUST_CROP_PADDING_RATIO);
+  const padY = Math.round(pixelRect.height * SCALE_ADJUST_CROP_PADDING_RATIO);
+  const left = clamp(pixelRect.left - padX, 0, Math.max(0, width - 1));
+  const top = clamp(pixelRect.top - padY, 0, Math.max(0, height - 1));
+  const right = clamp(
+    pixelRect.left + pixelRect.width + padX,
+    left + 1,
+    width
+  );
+  const bottom = clamp(
+    pixelRect.top + pixelRect.height + padY,
+    top + 1,
+    height
+  );
+
+  return {
+    left,
+    top,
+    width: Math.max(1, right - left),
+    height: Math.max(1, bottom - top),
+  };
+}
+
+async function createScaleAdjustCropReferences(params: {
+  regions: NormalizedLocalEditRegion[];
+  sourceBuffer: Buffer;
+  sourceHeight: number;
+  sourceWidth: number;
+}): Promise<ScaleAdjustCropReference[]> {
+  const references: ScaleAdjustCropReference[] = [];
+  const regionsForCrop = params.regions.slice(0, MAX_SCALE_ADJUST_CROP_REFERENCES);
+
+  for (const region of regionsForCrop) {
+    const cropBox = expandPixelRectForCrop({
+      height: params.sourceHeight,
+      pixelRect: region.pixelRect,
+      width: params.sourceWidth,
+    });
+    const cropBuffer = await sharp(params.sourceBuffer, { failOn: "none" })
+      .extract(cropBox)
+      .resize({
+        fit: "inside",
+        height: SCALE_ADJUST_CROP_MAX_EDGE,
+        withoutEnlargement: true,
+        width: SCALE_ADJUST_CROP_MAX_EDGE,
+      })
+      .png({ compressionLevel: 6 })
+      .toBuffer();
+    const upload = await uploadFile(
+      `canvas-scale-adjust-crop-r${region.index}-${Date.now()}-${Math.random()
+        .toString(36)
+        .slice(2, 8)}.png`,
+      toArrayBuffer(cropBuffer)
+    );
+    references.push({
+      regionIndex: region.index,
+      url: upload.url,
+    });
+  }
+
+  return references;
+}
+
 function wrapText(text: string, maxChars: number, maxLines = 3) {
   const compact = text.replace(/\s+/g, " ").trim();
   if (!compact) return [];
@@ -582,7 +658,8 @@ function buildLocalEditPrompt(regions: NormalizedLocalEditRegion[]) {
 
 function buildScaleAdjustPrompt(
   regions: NormalizedLocalEditRegion[],
-  scalePercent: ScaleAdjustPercent
+  scalePercent: ScaleAdjustPercent,
+  cropReferences: ScaleAdjustCropReference[] = []
 ) {
   const actionLabel = getScaleAdjustLabel(scalePercent);
   const targetLabel = getScaleAdjustTargetLabel(scalePercent);
@@ -602,13 +679,29 @@ function buildScaleAdjustPrompt(
       const bottom = pixel.top + pixel.height;
       const centerX = pixel.left + Math.round(pixel.width / 2);
       const centerY = pixel.top + Math.round(pixel.height / 2);
-      return `区域 ${region.index}（原始红色实线框：x=${left}%，y=${top}%，w=${width}%，h=${height}%；目标虚线框：x=${targetLeft}%，y=${targetTop}%，w=${targetWidth}%，h=${targetHeight}%；像素范围 left=${pixel.left}, top=${pixel.top}, right=${right}, bottom=${bottom}, center=(${centerX}, ${centerY})）：红色实线框只是“寻找目标主体”的范围，不是要缩放或贴回的矩形补丁；目标虚线框只是表达目标尺寸范围，不是要求主体填满矩形或变成矩形比例。请识别此范围内最主要的商品/物体主体，以主体自身轮廓、原始宽高比和视觉中心为准，执行整体等比${actionLabel}，宽度与高度必须使用同一个缩放倍率，目标主体视觉尺寸约为原主体的 ${targetLabel}。严禁宽度变窄但高度变高，严禁横向挤压、纵向拉伸或改变主体透视形体。如果框中只覆盖到主体的一部分，请根据连接关系推断该主体的完整可见结构，只调整该主体，不调整矩形框内背景。`;
+      const cropIndex = cropReferences.findIndex(
+        (reference) => reference.regionIndex === region.index
+      );
+      const cropNote =
+        cropIndex >= 0
+          ? `；输入图片${cropIndex + 3}是该区域的干净局部裁切参考图，只用于识别目标主体的轮廓与原始比例`
+          : "";
+      return `区域 ${region.index}（原始红色实线框：x=${left}%，y=${top}%，w=${width}%，h=${height}%；目标虚线框：x=${targetLeft}%，y=${targetTop}%，w=${targetWidth}%，h=${targetHeight}%；像素范围 left=${pixel.left}, top=${pixel.top}, right=${right}, bottom=${bottom}, center=(${centerX}, ${centerY})${cropNote}）：红色实线框只是“寻找目标主体”的范围，不是要缩放或贴回的矩形补丁；目标虚线框只是表达目标尺寸范围，不是要求主体填满矩形或变成矩形比例。请识别此范围内最主要的商品/物体主体，以主体自身轮廓、原始宽高比和视觉中心为准，执行整体等比${actionLabel}，宽度与高度必须使用同一个缩放倍率，目标主体视觉尺寸约为原主体的 ${targetLabel}。严禁宽度变窄但高度变高，严禁横向挤压、纵向拉伸或改变主体透视形体。如果框中只覆盖到主体的一部分，请根据连接关系推断该主体的完整可见结构，只调整该主体，不调整矩形框内背景。`;
     })
     .join("\n");
+  const cropLines = cropReferences
+    .map(
+      (reference, index) =>
+        `输入图片${index + 3}：区域 ${reference.regionIndex} 的原图干净局部裁切参考图，只用于确认要缩放的主体身份、轮廓和宽高比，不能当成输出底图，也不能把裁切图整体贴回。`
+    )
+    .join("\n");
 
   return [
     "输入图片1是原始干净图，也是最终输出必须继承的唯一画面基底。除目标主体尺寸变化与必要背景补全外，输入图片1中的文字、Logo、装饰、排版、背景、光线、构图边界和所有未选区域必须保持不变。",
     "输入图片2是定位参考图：它只用于告诉你用户框选的目标主体位置和目标尺寸范围，不是输出底图。输入图片2里的彩色框、编号、标签、半透明遮罩、文字和 UI 只是定位标记，绝不能出现在最终画面中，也不得影响输入图片1的文字和排版。",
+    cropLines
+      ? `输入图片3及之后是框选区域的干净局部裁切参考图，作用是帮助你确认“要缩放的是哪个主体”。这些裁切图不是输出底图，不得被整体放大、贴回或覆盖到原图上。\n${cropLines}`
+      : "",
     "输入图片2中的红色实线框表示目标主体当前大致位置；青绿色或绿色虚线框只表示比例调整后的安全尺寸范围。最终画面不得出现这些框线，主体也不需要填满虚线矩形；必须保持主体自身原始宽高比和透视形体。",
     "如果系统或模型只能读取一张参考图，必须优先以输入图片1为输出基底，不得清理、改写或删除输入图片1中框选区域外的任何文字和图形。",
     "系统已根据用户框选区域计算出下方每个区域的原图坐标；框选区域只是定位目标主体的搜索范围，不是最终画面的裁切块、贴片或蒙版边界。",
@@ -621,6 +714,7 @@ function buildScaleAdjustPrompt(
     "关键要求：",
     `1. 只调整目标主体物体本身的整体视觉比例，必须等比缩放到约 ${targetLabel}，不得保留原尺寸；主体轮廓宽度和高度必须使用同一个倍率同步变化，宽高比必须与原主体一致，不能为了贴合虚线框而拉宽、压窄、拉高或压扁。`,
     "2. 严禁把整个矩形框选区域当成图片块整体缩放、平移、复制、裁切或贴回；最终画面不得出现矩形拼接边缘、色差硬边、补丁感、裁切线或局部贴片痕迹。",
+    "2.1 严禁把输入图片1整张图整体放大、缩小、裁切或重新构图；如果画面中的标题、Logo、页面文字、边框、背景家具或非目标主体发生整体位移/缩放/消失，必须视为失败并重新生成。",
     `3. 缩小时，目标主体应围绕原位置视觉中心自然变小到约 ${targetLabel}；主体缩小后，原来被遮挡的背景、桌面、墙面、阴影、纹理和透视必须被重新生成并无缝补全，选区内应出现明显新增留白或背景。`,
     `4. 放大时，目标主体应围绕原位置视觉中心自然变大到约 ${targetLabel}；宽度和高度都要同步变大，不能出现“高度变高但宽度变窄”的非等比变形；主体边缘与遮挡关系要合理，不能产生突兀裁切。`,
     "5. 如果主体靠近画布边界导致目标尺寸空间不足，请用能完整放入画面的最大统一倍率整体缩放；绝不能为了塞进画面而只压缩宽度或只拉伸高度。",
@@ -741,16 +835,36 @@ export async function POST(request: NextRequest) {
       annotatedFilename,
       toArrayBuffer(annotatedBuffer)
     );
+    const scaleAdjustCropReferences = isScaleAdjustOperation
+      ? await createScaleAdjustCropReferences({
+          regions,
+          sourceBuffer,
+          sourceHeight,
+          sourceWidth,
+        })
+      : [];
     const prompt =
       isScaleAdjustOperation
-        ? buildScaleAdjustPrompt(regions, scalePercent as ScaleAdjustPercent)
+        ? buildScaleAdjustPrompt(
+            regions,
+            scalePercent as ScaleAdjustPercent,
+            scaleAdjustCropReferences
+          )
         : buildLocalEditPrompt(regions);
-    const regionReferenceImageUrls = regions.flatMap((region) =>
+    const manualRegionReferenceImageUrls = regions.flatMap((region) =>
       region.referenceImages.map((reference) => reference.url)
     );
+    const scaleAdjustCropReferenceImageUrls = scaleAdjustCropReferences.map(
+      (reference) => reference.url
+    );
     const referenceImages = isScaleAdjustOperation
-      ? [sourceImageUrl, annotatedUpload.url, ...regionReferenceImageUrls]
-      : [sourceImageUrl, ...regionReferenceImageUrls];
+      ? [
+          sourceImageUrl,
+          annotatedUpload.url,
+          ...scaleAdjustCropReferenceImageUrls,
+          ...manualRegionReferenceImageUrls,
+        ]
+      : [sourceImageUrl, ...manualRegionReferenceImageUrls];
     const resolvedAspectRatio = resolveLocalEditAspectRatio(
       body.aspectRatio,
       sourceWidth,
@@ -782,9 +896,13 @@ export async function POST(request: NextRequest) {
         requestedModel: requestedModel || null,
         resolvedAspectRatio,
         resolvedModel: resolvedModel || null,
-        regionReferenceImageCount: regionReferenceImageUrls.length,
+        manualRegionReferenceImageCount: manualRegionReferenceImageUrls.length,
+        regionReferenceImageCount:
+          manualRegionReferenceImageUrls.length +
+          scaleAdjustCropReferenceImageUrls.length,
         regionCount: regions.length,
         scalePercent,
+        scaleAdjustCropReferenceCount: scaleAdjustCropReferenceImageUrls.length,
         scaleAdjustUsesFullFrameOutput: isScaleAdjustOperation,
         sourceHeight,
         sourceNodeId: body.sourceNodeId || null,
diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index f9621e4b2..b0b2d90e6 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -116,8 +116,8 @@ const LOCAL_EDIT_COMPOSITE_FEATHER_MIN_PX = 10;
 const LOCAL_EDIT_COMPOSITE_FEATHER_MAX_PX = 44;
 const SCALE_ADJUST_VISUAL_DIFF_THRESHOLD = 14;
 const SCALE_ADJUST_OUTSIDE_DIFF_THRESHOLD = 18;
-const SCALE_ADJUST_OUTSIDE_DIFF_MIN_CHANGED_RATIO = 0.45;
-const SCALE_ADJUST_OUTSIDE_PROTECTED_MARGIN = 0.035;
+const SCALE_ADJUST_OUTSIDE_DIFF_MIN_CHANGED_RATIO = 0.28;
+const SCALE_ADJUST_OUTSIDE_PROTECTED_MARGIN = 0.015;
 const SCALE_ADJUST_DIFF_SAMPLE_SIZE = 112;
 
 const SUPPORTED_CANVAS_PROVIDER_TYPES = new Set([
@@ -362,7 +362,7 @@ function getScaleAdjustOutsideSampleRegions(
   verification: CanvasScaleAdjustVerificationConfig
 ) {
   const protectedRegions = getScaleAdjustProtectedRegions(verification);
-  const candidates: CanvasLocalEditCompositeRegion[] = [
+  const fixedCandidates: CanvasLocalEditCompositeRegion[] = [
     { x: 0.03, y: 0.03, width: 0.2, height: 0.16 },
     { x: 0.4, y: 0.03, width: 0.2, height: 0.16 },
     { x: 0.77, y: 0.03, width: 0.2, height: 0.16 },
@@ -378,13 +378,42 @@ function getScaleAdjustOutsideSampleRegions(
     { x: 0.28, y: 0.55, width: 0.18, height: 0.16 },
     { x: 0.54, y: 0.55, width: 0.18, height: 0.16 },
   ];
+  const gridCandidates: CanvasLocalEditCompositeRegion[] = [];
+  const columns = 7;
+  const rows = 7;
+  const cellWidth = 0.12;
+  const cellHeight = 0.1;
 
-  return candidates.filter(
-    (candidate) =>
-      !protectedRegions.some((protectedRegion) =>
-        canvasRegionsIntersect(candidate, protectedRegion)
-      )
-  );
+  for (let row = 0; row < rows; row += 1) {
+    for (let column = 0; column < columns; column += 1) {
+      gridCandidates.push({
+        x: (column / Math.max(1, columns - 1)) * (1 - cellWidth),
+        y: (row / Math.max(1, rows - 1)) * (1 - cellHeight),
+        width: cellWidth,
+        height: cellHeight,
+      });
+    }
+  }
+  const candidates = [...fixedCandidates, ...gridCandidates];
+  const uniqueCandidates = candidates.filter((candidate, index) => {
+    const key = `${candidate.x.toFixed(3)}:${candidate.y.toFixed(3)}:${candidate.width.toFixed(3)}:${candidate.height.toFixed(3)}`;
+    return (
+      candidates.findIndex(
+        (item) =>
+          `${item.x.toFixed(3)}:${item.y.toFixed(3)}:${item.width.toFixed(3)}:${item.height.toFixed(3)}` ===
+          key
+      ) === index
+    );
+  });
+
+  return uniqueCandidates
+    .filter(
+      (candidate) =>
+        !protectedRegions.some((protectedRegion) =>
+          canvasRegionsIntersect(candidate, protectedRegion)
+        )
+    )
+    .slice(0, 28);
 }
 
 function rectToPixelBox(params: {
@@ -524,7 +553,7 @@ function isScaleAdjustOutsideChanged(scores: number[]) {
     (score) => score >= SCALE_ADJUST_OUTSIDE_DIFF_THRESHOLD
   ).length;
   const requiredCount = Math.max(
-    2,
+    3,
     Math.ceil(scores.length * SCALE_ADJUST_OUTSIDE_DIFF_MIN_CHANGED_RATIO)
   );
   return changedCount >= requiredCount;