diff --git a/src/main/java/org/olat/core/util/openxml/OpenXMLDocument.java b/src/main/java/org/olat/core/util/openxml/OpenXMLDocument.java
index 319c22c0c9738a2acad5d300e25ee367ede5c40c..d4cf066313d15c238ad557e2475dd3ec2527dc8d 100644
--- a/src/main/java/org/olat/core/util/openxml/OpenXMLDocument.java
+++ b/src/main/java/org/olat/core/util/openxml/OpenXMLDocument.java
@@ -1368,7 +1368,7 @@ public class OpenXMLDocument {
 		appendPicture(grpSpEl, backgroundImageRef);
 		
 		for(OpenXMLGraphic element:elements) {
-			appendGraphicElementEl(grpSpEl, backgroundImageRef.getEmuSize(), element);
+			appendGraphicElementEl(grpSpEl, emuSize, element);
 		}
 
 		return drawingEl;
@@ -1417,7 +1417,7 @@ public class OpenXMLDocument {
 		<wps:bodyPr />
 	</wps:wsp>
 	*/
-	private void appendGraphicElementEl(Element parentEl, OpenXMLSize size, OpenXMLGraphic element) {
+	private void appendGraphicElementEl(Element parentEl, OpenXMLSize backgroundSize, OpenXMLGraphic element) {
 		Element wspEl = (Element)parentEl.appendChild(document.createElement("wps:wsp"));
 		
 		String formId = generateSimpleId();
@@ -1430,9 +1430,9 @@ public class OpenXMLDocument {
 		
 		Element spPrEl = (Element)wspEl.appendChild(document.createElement("wps:spPr"));
 		if(element.type() == OpenXMLGraphic.Type.rectangle) {
-			appendGraphicRectangle(spPrEl, size, element);
+			appendGraphicRectangle(spPrEl, backgroundSize, element);
 		} else if(element.type() == OpenXMLGraphic.Type.circle) {
-			appendGraphicEllipse(spPrEl, size, element);
+			appendGraphicEllipse(spPrEl, backgroundSize, element);
 		}
 	
 		appendGraphicSolidFill_transparent(spPrEl, element.getStyle());
@@ -1468,7 +1468,7 @@ public class OpenXMLDocument {
 		alphaEl.setAttribute("val", "50000");
 	}
 	
-	private void appendGraphicRectangle(Element spPrEl, OpenXMLSize size, OpenXMLGraphic element) {
+	private void appendGraphicRectangle(Element spPrEl, OpenXMLSize backgroundSize, OpenXMLGraphic element) {
 		/*
 		<a:xfrm>
 			<a:off x="2028190" y="581660" />
@@ -1480,8 +1480,8 @@ public class OpenXMLDocument {
 		List<Integer> coords = element.getCoords();
 		int leftx = coords.get(0);
 		int topy = coords.get(1);
-		int leftxEmu = OpenXMLUtils.convertPixelToEMUs(leftx, DPI, size.getResizeRatio());
-		int topyEmu = OpenXMLUtils.convertPixelToEMUs(topy, DPI, size.getResizeRatio());	
+		int leftxEmu = OpenXMLUtils.convertPixelToEMUs(leftx, DPI, backgroundSize.getResizeRatio());
+		int topyEmu = OpenXMLUtils.convertPixelToEMUs(topy, DPI, backgroundSize.getResizeRatio());	
 		aOffEl.setAttribute("x", Integer.toString(leftxEmu));
 		aOffEl.setAttribute("y", Integer.toString(topyEmu));
 		
@@ -1489,9 +1489,9 @@ public class OpenXMLDocument {
 		int rightx = coords.get(2);
 		int bottomy = coords.get(3);
 		int width = rightx -leftx;
-		int cx = OpenXMLUtils.convertPixelToEMUs(width, DPI, size.getResizeRatio());	
+		int cx = OpenXMLUtils.convertPixelToEMUs(width, DPI, backgroundSize.getResizeRatio());	
 		int height = bottomy - topy;
-		int cy = OpenXMLUtils.convertPixelToEMUs(height, DPI, size.getResizeRatio());	
+		int cy = OpenXMLUtils.convertPixelToEMUs(height, DPI, backgroundSize.getResizeRatio());	
 		aExtEl.setAttribute("cx", Integer.toString(cx));
 		aExtEl.setAttribute("cy", Integer.toString(cy));
 		/*
@@ -1504,7 +1504,7 @@ public class OpenXMLDocument {
 		prstGeomEl.appendChild(document.createElement("a:avLst"));
 	}
 	
-	private void appendGraphicEllipse(Element spPrEl, OpenXMLSize size, OpenXMLGraphic element) {
+	private void appendGraphicEllipse(Element spPrEl, OpenXMLSize backgroundSize, OpenXMLGraphic element) {
 		/*
 		<a:xfrm>
 			<a:off x="2028190" y="581660" />
@@ -1520,8 +1520,8 @@ public class OpenXMLDocument {
 		
 		int topx = centerx - radius;
 		int lefty = centery - radius;
-		int topxEmu = OpenXMLUtils.convertPixelToEMUs(topx, DPI, size.getResizeRatio());
-		int leftyEmu = OpenXMLUtils.convertPixelToEMUs(lefty, DPI, size.getResizeRatio());
+		int topxEmu = OpenXMLUtils.convertPixelToEMUs(topx, DPI, backgroundSize.getResizeRatio());
+		int leftyEmu = OpenXMLUtils.convertPixelToEMUs(lefty, DPI, backgroundSize.getResizeRatio());
 		
 		aOffEl.setAttribute("x", Integer.toString(topxEmu));
 		aOffEl.setAttribute("y", Integer.toString(leftyEmu));
@@ -1529,7 +1529,7 @@ public class OpenXMLDocument {
 		Element aExtEl = (Element)aXfrmEl.appendChild(document.createElement("a:ext"));
 		
 		int width = (radius * 2);
-		int widthEmu = OpenXMLUtils.convertPixelToEMUs(width, DPI, size.getResizeRatio());
+		int widthEmu = OpenXMLUtils.convertPixelToEMUs(width, DPI, backgroundSize.getResizeRatio());
 		aExtEl.setAttribute("cx", Integer.toString(widthEmu));
 		aExtEl.setAttribute("cy", Integer.toString(widthEmu));
 		/*
diff --git a/src/main/java/org/olat/core/util/openxml/OpenXMLUtils.java b/src/main/java/org/olat/core/util/openxml/OpenXMLUtils.java
index 307ece7f899431913d18b8d9e5599057db2d7404..915200463c974699f7d7e66d5bc34977cdf2ae3d 100644
--- a/src/main/java/org/olat/core/util/openxml/OpenXMLUtils.java
+++ b/src/main/java/org/olat/core/util/openxml/OpenXMLUtils.java
@@ -69,7 +69,7 @@ public class OpenXMLUtils {
 
 	public static final int convertPixelToEMUs(int pixel, int dpi, double resizeRatio) {
 		double rezDpi = dpi * 1.0d;
-		return (int)(((pixel / rezDpi) * emusPerInch) / resizeRatio);
+		return (int)(((pixel / rezDpi) * emusPerInch) * resizeRatio);
 	}
 	
 	public static final OpenXMLSize convertPixelToEMUs2(Size img, int dpi) {