SVG - dégradé

[Wells]

Code :

<filter id="dropshadow">
                    <feFlood        flood-color="#ff0000"            result="glowcolor"/>
                    <feFlood        flood-color="transparent"        result="fillcolor"/>
                    <feFlood        flood-color="#ff0000"               result="strokecolor"/>
        
                    <feGaussianBlur    stdDeviation="2"    in="SourceGraphic"    result="glow0"/>
                    <feComposite    in="glow0"            in2="SourceAlpha"    operator="out"    result="glow1"    />
                    <feColorMatrix in="glow1" values="0 0 0 0 1 0 0 0 0 1 0 0 0 0 5 0 0 0 5 0" result="glow2"/>
                    <feComposite    in="glowcolor"        in2="glow2"        operator="in"    result="glow"/>
        
                    <feComposite    in="fillcolor"        in2="SourceGraphic"    operator="in"    result="fill"/>
                    <feColorMatrix    in="SourceGraphic"    type="luminanceToAlpha"             result="strokealpha"/>
                    <feComposite    in="strokecolor"        in2="strokealpha"    operator="in"    result="stroke"/>
                    <feMerge>
                        <feMergeNode     in="fill"/>
                        <feMergeNode    in="glow"/>
                        <feMergeNode     in="stroke"/>
                    </feMerge>
                </filter>

J'ai inverser en metant en out, mais ca donne pas grand chose :

http://foot2014.septentrion-game.com/carto2.png

Ca fait juste un cercle, c'est pas terrible, j'ai du oublié un truc ^^