1 <svg xmlns=
"http://www.w3.org/2000/svg" xmlns:
xlink=
"http://www.w3.org/1999/xlink">
2 <defs> <filter id=
"foo"> <feConvolveMatrix kernelMatrix=
"0 0 0 0 1 0 0 0 -1"/> </filter> </defs>
3 <image width=
"2" height=
"3" xlink:
href=
"bar" filter=
"url(#foo)" />
4 <rect x=
"10" y=
"10" width=
"100" height=
"100" fill=
"green"/>