Emit Fluid From A Texture On An Emitter Object?

[lxdengar]

I'm sure its been asked here before (I did a search, honest!), but can someone explain to me how to emit fluids from a texture on an emitter object? Say a perlin noise map, fluid emits from white, doesn't from black. This is in a 3d container.

I thought I could just simply "Add a new texture" to the fluid emitter's density/voxel/sec function, but this doesn't work.

Thank you for the help!