feImage primitive create raster from external graphic or defined element as result
parameters:
Example of code:
<defs>
<filter id="MyFilter" filterUnits="userSpaceOnUse" x="0" y="0" width="400" height="400">
<feImage xlink:href='fondu3.jpg' result='pict1'/>
<feImage xlink:href='bateau.jpg' result='pict2'/>
<feBlend in='pict1' in2='pict2' mode="screen"/>
</filter>
</defs>
<use filter="url(#MyFilter)" x='0' y='0'/>

Figure 1: The pictures and result for code above
FrontPage feColorMatrix feComponentTransfer feSpecularLightning feDiffuseLightning feSpotLight feDistantLight fePointLight feFlood feImage feTurbulence feTile feMerge feBlend feComposite feGaussianBlur feMorphology feConvolveMatrix feDisplacementMap feOffset