diff --git a/melpomene.js b/melpomene.js
index 1ca0744..a3a8e3c 100644
--- a/melpomene.js
+++ b/melpomene.js
@@ -180,11 +180,11 @@ function getPagesCount() {
 }
 
 function pageOriginalHeight(pageNumber) {
-    return READER_PAGES.children[pageNumber - 1].height
+    return READER_PAGES.children[pageNumber - 1].naturalHeight
 }
 
 function pageOriginalWidth(pageNumber) {
-    return READER_PAGES.children[pageNumber - 1].width
+    return READER_PAGES.children[pageNumber - 1].naturalWidth
 }
 
 function readerFrameRatio() {
@@ -192,15 +192,15 @@ function readerFrameRatio() {
 }
 
 function pageRatio(pageNumber) {
-    return READER_PAGES.children[pageNumber - 1].width / READER_PAGES.children[pageNumber - 1].height
+    return READER_PAGES.children[pageNumber - 1].naturalWidth / READER_PAGES.children[pageNumber - 1].naturalHeight
 }
 
 function pageMaxHeight(){
     let max_height = 0
     
     for (var i = 0; i < READER_PAGES.children.length; i++) {
-        if(READER_PAGES.children[i].height > max_height){
-            max_height = READER_PAGES.children[i].height
+        if(READER_PAGES.children[i].naturalHeight > max_height){
+            max_height = READER_PAGES.children[i].naturalHeight
         }
     }
     
@@ -217,7 +217,7 @@ function previousPagesWidth(pageNumber) {
     let totalWidth = 0
     
     for (let idx = 0; idx < pageNumber - 1; idx++){
-        totalWidth = totalWidth + READER_PAGES.children[idx].width
+        totalWidth = totalWidth + READER_PAGES.children[idx].naturalWidth
     }
     
     return totalWidth