diff --git a/sakura_core/Makefile b/sakura_core/Makefile
index 374268373d..1b5498732f 100644
--- a/sakura_core/Makefile
+++ b/sakura_core/Makefile
@@ -46,6 +46,8 @@ LIBS= \
  -limagehlp \
  -lshlwapi \
  -lwinmm \
+ -lwindowscodecs \
+ -lmsimg32 \
  -mwindows \
  $(MYLIBS)
 
diff --git a/sakura_core/doc/CEditDoc.cpp b/sakura_core/doc/CEditDoc.cpp
index 2a4c4ccdef..39f8e6a85f 100644
--- a/sakura_core/doc/CEditDoc.cpp
+++ b/sakura_core/doc/CEditDoc.cpp
@@ -45,6 +45,9 @@
 #include <string.h>	// Apr. 03, 2003 genta
 #include <memory>
 #include <OleCtl.h>
+#include <wincodec.h>
+#pragma comment(lib, "windowscodecs.lib")
+#include <wrl.h>
 #include "doc/CEditDoc.h"
 #include "doc/logic/CDocLine.h" /// 2002/2/3 aroka
 #include "doc/layout/CLayout.h"	// 2007.08.22 ryoji 追加
@@ -317,61 +320,70 @@ void CEditDoc::SetBackgroundImage()
 		GetInidirOrExedir( &fullPath[0], &path[0] );
 		path = fullPath;
 	}
-	const TCHAR* ext = path.GetExt();
-	if( 0 != auto_stricmp(ext, _T(".bmp")) ){
-		HANDLE hFile = ::CreateFile(path.c_str(), GENERIC_READ, 0, 0, OPEN_EXISTING, 0, 0);
-		if( hFile == INVALID_HANDLE_VALUE ){
-			return;
-		}
-		DWORD fileSize  = ::GetFileSize(hFile, NULL);
-		HGLOBAL hGlobal = ::GlobalAlloc(GMEM_MOVEABLE, fileSize);
-		if( hGlobal == NULL ){
-			::CloseHandle(hFile);
-			return;
-		}
-		DWORD nRead;
-		BOOL bRead = ::ReadFile(hFile, GlobalLock(hGlobal), fileSize, &nRead, NULL);
-		::CloseHandle(hFile);
-		hFile = NULL;
-		if( !bRead ){
-			::GlobalFree(hGlobal);
-			return;
-		}
-		::GlobalUnlock(hGlobal);
-		{
-			IPicture* iPicture = NULL;
-			IStream*  iStream = NULL;
-			//hGlobalの管理を移譲
-			if( S_OK != ::CreateStreamOnHGlobal(hGlobal, TRUE, &iStream) ){
-				GlobalFree(hGlobal);
-			}else{
-				if( S_OK != ::OleLoadPicture(iStream, fileSize, FALSE, IID_IPicture, (void**)&iPicture) ){
-				}else{
-					HBITMAP hBitmap = NULL;
-					short imgType = PICTYPE_NONE;
-					if( S_OK == iPicture->get_Type(&imgType) && imgType == PICTYPE_BITMAP &&
-					    S_OK == iPicture->get_Handle((OLE_HANDLE*)&hBitmap) ){
-						m_nBackImgWidth = m_nBackImgHeight = 1;
-						m_hBackImg = (HBITMAP)::CopyImage(hBitmap, IMAGE_BITMAP, 0, 0, 0);
-					}
-				}
-			}
-			if( iStream )  iStream->Release();
-			if( iPicture ) iPicture->Release();
-		}
-	}else{
-		m_hBackImg = (HBITMAP)::LoadImage(NULL, path.c_str(), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
-	}
-	if( m_hBackImg ){
-		BITMAP bmp;
-		GetObject(m_hBackImg, sizeof(BITMAP), &bmp);
-		m_nBackImgWidth  = bmp.bmWidth;
-		m_nBackImgHeight = bmp.bmHeight;
-		if( 0 == m_nBackImgWidth || 0 == m_nBackImgHeight ){
-			::DeleteObject(m_hBackImg);
-			m_hBackImg = NULL;
-		}
+
+	using namespace Microsoft::WRL;
+	ComPtr<IWICImagingFactory> pIWICFactory;
+	HRESULT hr;
+	hr = CoCreateInstance(
+		CLSID_WICImagingFactory,
+		NULL,
+		CLSCTX_INPROC_SERVER,
+		IID_PPV_ARGS(&pIWICFactory));
+	if( FAILED(hr) ) return;
+	ComPtr<IWICBitmapDecoder> pDecoder;
+	hr = pIWICFactory->CreateDecoderFromFilename(
+		path.c_str(),
+		NULL,
+		GENERIC_READ,
+		WICDecodeMetadataCacheOnLoad,
+		&pDecoder);
+	if( FAILED(hr) ) return;
+	ComPtr<IWICBitmapFrameDecode> pFrame;
+	hr = pDecoder->GetFrame(0, &pFrame);
+	if( FAILED(hr) ) return;
+	//WICPixelFormatGUID pixelFormat;
+	//hr = pFrame->GetPixelFormat(&pixelFormat);
+	//if( FAILED(hr) ) return;
+	ComPtr<IWICFormatConverter> pConverter;
+	pIWICFactory->CreateFormatConverter(&pConverter);
+	if( FAILED(hr) ) return;
+	hr = pConverter->Initialize(
+		pFrame.Get(),
+		GUID_WICPixelFormat32bppPBGRA,
+		WICBitmapDitherTypeNone,
+		NULL,
+		0.f,
+		WICBitmapPaletteTypeCustom);
+	if( FAILED(hr) ) return;
+	UINT width, height;
+	hr = pConverter->GetSize(&width, &height);
+	if( FAILED(hr) ) return;
+	BITMAPINFO bminfo = {0};
+	BITMAPINFOHEADER& bmih = bminfo.bmiHeader;
+	bmih.biSize	= sizeof(BITMAPINFOHEADER);
+	bmih.biWidth = (LONG)width;
+	bmih.biHeight = -(LONG)height;
+	bmih.biPlanes = 1;
+	bmih.biBitCount = 32;
+	bmih.biCompression = BI_RGB;
+	HDC hdcScreen = GetDC(NULL);
+	if( !hdcScreen ) return;
+	void *pvImageBits = NULL;
+	m_hBackImg = CreateDIBSection(hdcScreen, &bminfo, DIB_RGB_COLORS, &pvImageBits, NULL, 0);
+	ReleaseDC(NULL, hdcScreen);
+	if( !m_hBackImg ) return;
+	UINT lineStride = 4 * width;
+	hr = pConverter->CopyPixels(
+		NULL,
+		lineStride,
+		lineStride * height, 
+		(BYTE*)pvImageBits);
+	if( FAILED(hr) ){
+		::DeleteObject(m_hBackImg);
+		m_hBackImg = NULL;
 	}
+	m_nBackImgWidth = (int)width;
+	m_nBackImgHeight = (int)height;
 }
 
 /* 全ビューの初期化：ファイルオープン/クローズ時等に、ビューを初期化する */
diff --git a/sakura_core/typeprop/CPropTypesWindow.cpp b/sakura_core/typeprop/CPropTypesWindow.cpp
index a96aab995c..b35faf8d02 100644
--- a/sakura_core/typeprop/CPropTypesWindow.cpp
+++ b/sakura_core/typeprop/CPropTypesWindow.cpp
@@ -141,7 +141,7 @@ INT_PTR CPropTypesWindow::DispatchEvent(
 			case IDC_BUTTON_BACKIMG_PATH_SEL:
 				{
 					CDlgOpenFile::SelectFile(hwndDlg, GetDlgItem(hwndDlg, IDC_EDIT_BACKIMG_PATH),
-						_T("*.bmp;*.jpg;*.jpeg"), true, EFITER_NONE );
+						_T("*.bmp;*.jpg;*.jpeg;*.png"), true, EFITER_NONE );
 				}
 				return TRUE;
 			//	From Here Sept. 10, 2000 JEPRO
diff --git a/sakura_core/view/CEditView_Paint.cpp b/sakura_core/view/CEditView_Paint.cpp
index 55680d5061..3d4b671f74 100644
--- a/sakura_core/view/CEditView_Paint.cpp
+++ b/sakura_core/view/CEditView_Paint.cpp
@@ -26,6 +26,7 @@
 #include "StdAfx.h"
 #include <vector>
 #include <limits.h>
+#pragma comment(lib, "Msimg32.lib")
 #include "view/CEditView_Paint.h"
 #include "view/CEditView.h"
 #include "view/CViewFont.h"
@@ -198,6 +199,8 @@ void CEditView::DrawBackImage(HDC hdc, RECT& rcPaint, HDC hdcBgImg)
 #else
 	CTypeSupport cTextType(this,COLORIDX_TEXT);
 	COLORREF colorOld = ::SetBkColor(hdc, cTextType.GetBackColor());
+	MyFillRect(hdc, rcPaint);
+
 	const CTextArea& area = GetTextArea();
 	const CEditDoc& doc  = *m_pcEditDoc;
 	const STypeConfig& typeConfig = doc.m_cDocType.GetDocumentAttribute();
@@ -279,20 +282,29 @@ void CEditView::DrawBackImage(HDC hdc, RECT& rcPaint, HDC hdcBgImg)
 	CMyRect rcBltAll;
 	rcBltAll.SetLTRB(INT_MAX, INT_MAX, -INT_MAX, -INT_MAX);
 	CMyRect rcImagePosOrg = rcImagePos;
+	BLENDFUNCTION bf;
+	bf.BlendOp = AC_SRC_OVER;
+	bf.BlendFlags = 0;
+	bf.SourceConstantAlpha = 0xFF;
+	bf.AlphaFormat = AC_SRC_ALPHA;
 	for(; rcImagePos.top <= nYEnd; ){
 		for(; rcImagePos.left <= nXEnd; ){
 			CMyRect rcBlt;
 			if( ::IntersectRect(&rcBlt, &rc, &rcImagePos) ){
-				::BitBlt(
+				int width = rcBlt.right  - rcBlt.left;
+				int height = rcBlt.bottom - rcBlt.top;
+				::AlphaBlend(
 					hdc,
 					rcBlt.left,
 					rcBlt.top,
-					rcBlt.right  - rcBlt.left,
-					rcBlt.bottom - rcBlt.top,
+					width,
+					height,
 					hdcBgImg,
 					rcBlt.left - rcImagePos.left,
 					rcBlt.top - rcImagePos.top,
-					SRCCOPY
+					width,
+					height,
+					bf
 				);
 				rcBltAll.left   = t_min(rcBltAll.left,   rcBlt.left);
 				rcBltAll.top    = t_min(rcBltAll.top,    rcBlt.top);
@@ -336,8 +348,6 @@ void CEditView::DrawBackImage(HDC hdc, RECT& rcPaint, HDC hdcBgImg)
 		if( y3 < y4 ){
 			rcFill.SetLTRB(x1,y3, x4,y4); MyFillRect(hdc, rcFill);
 		}
-	}else{
-		MyFillRect(hdc, rc);
 	}
 	::SetBkColor(hdc, colorOld);
 #endif
diff --git a/tests/unittests/CMakeLists.txt b/tests/unittests/CMakeLists.txt
index 61ad2acbc6..1a408f5d5a 100644
--- a/tests/unittests/CMakeLists.txt
+++ b/tests/unittests/CMakeLists.txt
@@ -50,4 +50,4 @@ elseif (MINGW)
 	list (TRANSFORM ALL_O REPLACE "\\.(cpp|rc)$" ".o")
 	target_link_libraries (${project_name} PRIVATE ${ALL_O})
 endif ()
-target_link_libraries (${project_name} PRIVATE winspool ole32 oleaut32 uuid comctl32 imm32 mpr imagehlp shlwapi winmm)
+target_link_libraries (${project_name} PRIVATE winspool ole32 oleaut32 uuid comctl32 imm32 mpr imagehlp shlwapi winmm windowscodecs msimg32)