diff --git a/TIASshot/Cameras/CameraBase.cs b/TIASshot/Cameras/CameraBase.cs
index 1b1d3d2..8e0eaac 100644
--- a/TIASshot/Cameras/CameraBase.cs
+++ b/TIASshot/Cameras/CameraBase.cs
@@ -141,7 +141,7 @@
 
             var filename = Config.GetString("File/RgbImage");
             filename = filename.Replace("{NO}", $"{idx + 1:0000}");
-            Cv2.ImWrite(IoUtil.CombineSaveFilePath(_saveFolder, filename), img);
+            IoUtil.SaveImage(IoUtil.CombineSaveFilePath(_saveFolder, filename), img);
 
             foreach (var channel in _colorCorrector.Channels) {
                 // ConvertImage は src を in-place で CV_64FC3 に変換するため、
@@ -152,7 +152,7 @@
                 using (var converted = _colorCorrector.ConvertImage(imgClone, channel)) {
                     filename = GetFilenameWithChannel("File/SrgbImage", channel);
                     filename = filename.Replace("{NO}", $"{idx + 1:0000}");
-                    Cv2.ImWrite(IoUtil.CombineSaveFilePath(_saveFolder, filename), converted);
+                    IoUtil.SaveImage(IoUtil.CombineSaveFilePath(_saveFolder, filename), converted);
                 }
             }
         }
@@ -288,8 +288,8 @@
                 // データ保存
                 SetSaveFolder("校正");
                 SetInfo("校正データ", _saveFolder);
-                Cv2.ImWrite(IoUtil.CombineSaveFilePath(_saveFolder, Config.GetString("File/TccImage")), img);
-                Cv2.ImWrite(IoUtil.CombineSaveFilePath(_saveFolder, Config.GetString("File/TccRoisImage")), imgRois);
+                IoUtil.SaveImage(IoUtil.CombineSaveFilePath(_saveFolder, Config.GetString("File/TccImage")), img);
+                IoUtil.SaveImage(IoUtil.CombineSaveFilePath(_saveFolder, Config.GetString("File/TccRoisImage")), imgRois);
 
                 // 変換行列の計算・保存は ColorCorrector に委譲する（tccRgb の所有権は渡さない）
                 _colorCorrector.CalcTcc(tccRgb, _saveFolder, IoUtil.SaveMatToCsv);