diff --git a/android/app/src/main/kotlin/com/example/mini_tias/MainActivity.kt b/android/app/src/main/kotlin/com/example/mini_tias/MainActivity.kt
index 3b19bf4..a8fc1e4 100644
--- a/android/app/src/main/kotlin/com/example/mini_tias/MainActivity.kt
+++ b/android/app/src/main/kotlin/com/example/mini_tias/MainActivity.kt
@@ -1,10 +1,13 @@
 package com.example.mini_tias
 
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.android.RenderMode
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 
 class MainActivity : FlutterActivity() {
+    override fun getRenderMode(): RenderMode = RenderMode.texture
+
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
 
diff --git a/android/app/src/main/kotlin/com/example/mini_tias/RawCapturePlugin.kt b/android/app/src/main/kotlin/com/example/mini_tias/RawCapturePlugin.kt
index 9581a0e..017dbc2 100644
--- a/android/app/src/main/kotlin/com/example/mini_tias/RawCapturePlugin.kt
+++ b/android/app/src/main/kotlin/com/example/mini_tias/RawCapturePlugin.kt
@@ -1,20 +1,27 @@
 package com.example.mini_tias
 
+import android.app.Activity
 import android.content.Context
+import android.graphics.Bitmap
 import android.graphics.ImageFormat
+import android.graphics.Matrix
 import android.hardware.camera2.*
 import android.media.ImageReader
 import android.media.MediaScannerConnection
 import android.os.Handler
 import android.os.HandlerThread
+import android.view.PixelCopy
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
+import java.io.ByteArrayOutputStream
 
 /**
  * Camera2 API を使用してフロントカメラから YUV_420_888 フォーマットで
  * フル解像度の画像を 1 フレームキャプチャする．
  */
-class RawCapturePlugin(private val context: Context) : MethodChannel.MethodCallHandler {
+class RawCapturePlugin(private val activity: Activity) : MethodChannel.MethodCallHandler {
+
+    private val context: Context = activity.applicationContext
 
     private var backgroundThread: HandlerThread? = null
     private var backgroundHandler: Handler? = null
@@ -23,6 +30,7 @@
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
             "captureFullResolutionYuv" -> captureFullResolutionYuv(result)
+            "capturePreviewFrame" -> capturePreviewFrame(call, result)
             "scanFile" -> {
                 val path = call.argument<String>("path")
                 if (path != null) {
@@ -37,6 +45,57 @@
         }
     }
 
+    /// PixelCopy で全画面をキャプチャし，指定領域を切り取って 180° 回転して返す．
+    private fun capturePreviewFrame(call: MethodCall, result: MethodChannel.Result) {
+        val x = call.argument<Int>("x") ?: 0
+        val y = call.argument<Int>("y") ?: 0
+        val cropWidth = call.argument<Int>("width") ?: 0
+        val cropHeight = call.argument<Int>("height") ?: 0
+
+        val window = activity.window
+        val view = window.decorView
+        val bitmap = Bitmap.createBitmap(view.width, view.height, Bitmap.Config.ARGB_8888)
+
+        val handler = Handler(activity.mainLooper)
+        PixelCopy.request(window, bitmap, { copyResult ->
+            if (copyResult == PixelCopy.SUCCESS) {
+                try {
+                    val output = if (cropWidth > 0 && cropHeight > 0) {
+                        // Dart 側で回転済み左上座標を計算済み
+                        val cx = x.coerceIn(0, bitmap.width - 1)
+                        val cy = y.coerceIn(0, bitmap.height - 1)
+                        val cw = cropWidth.coerceAtMost(bitmap.width - cx)
+                        val ch = cropHeight.coerceAtMost(bitmap.height - cy)
+
+                        // 切り取り
+                        val cropped = Bitmap.createBitmap(bitmap, cx, cy, cw, ch)
+                        bitmap.recycle()
+
+                        // 180° 回転（app.dart の回転を相殺）
+                        val matrix = Matrix()
+                        matrix.postRotate(180f)
+                        val rotated = Bitmap.createBitmap(cropped, 0, 0, cropped.width, cropped.height, matrix, true)
+                        cropped.recycle()
+                        rotated
+                    } else {
+                        bitmap
+                    }
+
+                    val stream = ByteArrayOutputStream()
+                    output.compress(Bitmap.CompressFormat.JPEG, 85, stream)
+                    output.recycle()
+                    result.success(stream.toByteArray())
+                } catch (e: Exception) {
+                    bitmap.recycle()
+                    result.error("PROCESS_ERROR", "スナップショット処理に失敗: ${e.message}", null)
+                }
+            } else {
+                bitmap.recycle()
+                result.error("PIXEL_COPY_FAILED", "PixelCopy に失敗: $copyResult", null)
+            }
+        }, handler)
+    }
+
     private fun captureFullResolutionYuv(result: MethodChannel.Result) {
         startBackgroundThread()
 
diff --git a/lib/screens/capture_screen.dart b/lib/screens/capture_screen.dart
index 7fa4a0b..e1f7f21 100644
--- a/lib/screens/capture_screen.dart
+++ b/lib/screens/capture_screen.dart
@@ -1,9 +1,11 @@
 import 'dart:async';
+import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import 'package:mini_tias/providers/camera_provider.dart';
+import 'package:mini_tias/services/raw_capture_service.dart';
 import 'package:mini_tias/widgets/camera_preview.dart';
 import 'package:mini_tias/widgets/shutter_button.dart';
 
@@ -21,6 +23,8 @@
   bool _timerEnabled = false;
   int? _countdown;
   Timer? _countdownTimer;
+  Uint8List? _snapshotBytes;
+  final _rawCaptureService = RawCaptureService();
 
   @override
   void initState() {
@@ -56,10 +60,40 @@
     if (_timerEnabled) {
       _startCountdown();
     } else {
-      cameraProvider.takePicture();
+      _captureWithSnapshot();
     }
   }
 
+  Future<void> _captureWithSnapshot() async {
+    // PixelCopy でカメラ領域のスナップショットを瞬時に取得
+    try {
+      if (!mounted) return;
+      final renderBox = context.findRenderObject() as RenderBox?;
+      if (renderBox != null) {
+        final position = renderBox.localToGlobal(Offset.zero);
+        final size = renderBox.size;
+        final ratio = View.of(context).devicePixelRatio;
+
+        // localToGlobal は回転後の座標（右下）を返すため，左上を計算する
+        final topLeftX = position.dx - size.width;
+        final topLeftY = position.dy - size.height;
+
+        final bytes = await _rawCaptureService.capturePreviewFrame(
+          x: (topLeftX * ratio).round(),
+          y: (topLeftY * ratio).round(),
+          width: (size.width * ratio).round(),
+          height: (size.height * ratio).round(),
+        );
+        setState(() => _snapshotBytes = bytes);
+      }
+    } catch (_) {
+      // 失敗しても撮影は続行
+    }
+
+    if (!mounted) return;
+    context.read<CameraProvider>().takePicture();
+  }
+
   void _startCountdown() {
     setState(() => _countdown = 3);
     _countdownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
@@ -70,7 +104,7 @@
       if (_countdown! <= 1) {
         timer.cancel();
         setState(() => _countdown = null);
-        context.read<CameraProvider>().takePicture();
+        _captureWithSnapshot();
       } else {
         setState(() => _countdown = _countdown! - 1);
       }
@@ -89,6 +123,7 @@
     final fileName = cameraProvider.lastSavedFileName;
     if (fileName != null && fileName != _previousFileName) {
       _previousFileName = fileName;
+      _snapshotBytes = null;
       WidgetsBinding.instance.addPostFrameCallback((_) {
         if (!mounted) return;
         ScaffoldMessenger.of(context).showSnackBar(
@@ -132,15 +167,26 @@
       return Center(child: Text(cameraProvider.errorMessage!));
     }
 
-    if (!cameraProvider.isInitialized) {
+    if (!cameraProvider.isInitialized &&
+        !cameraProvider.isSaving &&
+        _snapshotBytes == null) {
       return const Center(child: CircularProgressIndicator());
     }
 
     return Stack(
       children: [
-        Positioned.fill(
-          child: CameraPreviewWidget(controller: cameraProvider.controller!),
-        ),
+        // 保存中はスナップショットを表示（Transform なし，Kotlin 側で回転済み）
+        if (_snapshotBytes != null &&
+            (!cameraProvider.isInitialized || cameraProvider.isSaving))
+          Positioned.fill(
+            child: Image.memory(_snapshotBytes!, fit: BoxFit.cover),
+          )
+        // カメラプレビュー
+        else if (cameraProvider.isInitialized &&
+            cameraProvider.controller != null)
+          Positioned.fill(
+            child: CameraPreviewWidget(controller: cameraProvider.controller!),
+          ),
         // 保存中インジケーター
         if (cameraProvider.isSaving)
           const Center(
@@ -161,7 +207,6 @@
           Center(
             child: Stack(
               children: [
-                // 黒い縁取り
                 Text(
                   '$_countdown',
                   style: TextStyle(
@@ -173,10 +218,9 @@
                       ..color = Colors.black,
                   ),
                 ),
-                // 白いテキスト本体
                 Text(
                   '$_countdown',
-                  style: TextStyle(
+                  style: const TextStyle(
                     color: Colors.white,
                     fontSize: 96,
                     fontWeight: FontWeight.bold,
diff --git a/lib/services/raw_capture_service.dart b/lib/services/raw_capture_service.dart
index 8a92d39..96faec2 100644
--- a/lib/services/raw_capture_service.dart
+++ b/lib/services/raw_capture_service.dart
@@ -5,11 +5,6 @@
   static const _channel = MethodChannel('com.example.mini_tias/raw_capture');
 
   /// フロントカメラからフル解像度の YUV データをキャプチャする．
-  ///
-  /// 返り値は YUV データを含む Map:
-  /// - width, height: 画像サイズ
-  /// - yPlane, uPlane, vPlane: YUV プレーンのバイトデータ
-  /// - yRowStride, uvRowStride, uvPixelStride: ストライド情報
   Future<Map<String, dynamic>> captureFullResolutionYuv() async {
     final result = await _channel
         .invokeMethod('captureFullResolutionYuv')
@@ -20,6 +15,23 @@
     return Map<String, dynamic>.from(result as Map);
   }
 
+  /// PixelCopy でカメラプレビュー領域のスナップショットを JPEG として取得する．
+  Future<Uint8List> capturePreviewFrame({
+    required int x,
+    required int y,
+    required int width,
+    required int height,
+  }) async {
+    final result = await _channel.invokeMethod<Uint8List>(
+      'capturePreviewFrame',
+      {'x': x, 'y': y, 'width': width, 'height': height},
+    );
+    if (result == null) {
+      throw Exception('プレビューフレームの取得に失敗しました');
+    }
+    return result;
+  }
+
   /// MediaStore にファイルを登録し，PC から MTP で見えるようにする．
   Future<void> scanFile(String path) async {
     await _channel.invokeMethod('scanFile', {'path': path});