diff --git a/egami/Image.cpp b/egami/Image.cpp
index ae1974c..0748efe 100644
--- a/egami/Image.cpp
+++ b/egami/Image.cpp
@@ -56,6 +56,12 @@ egami::Image::Image(const ivec2& _size, enum colorType _type) :
 	configure(_size, _type);
 }
 
+void egami::Image::swap(egami::Image& _obj) {
+	ememory::SharedPtr<ImagePrivate> tmp = m_data;
+	m_data = _obj.m_data;
+	_obj.m_data = tmp;
+}
+
 void egami::Image::configure(const ivec2& _size, enum colorType _type) {
 	switch (_type) {
 		case egami::colorType::undefined:
diff --git a/egami/Image.hpp b/egami/Image.hpp
index efbc3e1..3901efc 100644
--- a/egami/Image.hpp
+++ b/egami/Image.hpp
@@ -85,6 +85,7 @@ namespace egami {
 			bool exist() {
 				return m_data != nullptr;
 			}
+			void swap(egami::Image& _obj);
 		// -----------------------------------------------
 		// -- basic tools :
 		// -----------------------------------------------