use image resolution instead of window row/col size to display the image attachment

bin/muttimage

@@ -1,5 +1,11 @@
 #!/bin/bash
-height=$(stty  size | awk 'BEGIN {FS = " "} {print $1;}')
-width=$(stty  size | awk 'BEGIN {FS = " "} {print $2;}')
+
+#get image resolution
+resolution=$(identify $1 | awk '{print $3}')
+IFS='x' # x is set as delimiter
+read -ra ADDR <<< "$resolution" 
+width=${ADDR[0]}
+height=${ADDR[1]}
+
 ### Display Image / offset with mutt bar
-echo -e "2;3;\n0;1;210;20;$((width*7-250));$((height*14-100));0;0;0;0;$1\n4;\n3;" |  /usr/lib/w3m/w3mimgdisplay &
+echo -e "2;3;\n0;1;0;42;$((width));$((height));0;0;0;0;$1\n4;\n3;" |  /usr/lib/w3m/w3mimgdisplay &