After creating a texture map on my grid, I read the Texture Map color's brightness and tested if it was Less Than or Equal to .5. If it was, I "hid" the particles by scaling them to 0,0,0.
I couldn't figure out how to delete the points; if you could, I'm not sure it would work correctly with an animated texture.
Also note, I scaled the texture projection down slightly to avoid incorrect values around the edge of the image.
Hopefully this helps.
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