I have a very complex graphic that only exists as a png. The graphic has a lot of dot gradients and tones set in black. The graphic currently only works against a white background. I need it to work on a black background. If I try to do it the cheap way by inverting the colors, all I get is a negative that does not look good and it's indecipherable to what the graphic is. Is there a way in PS to essentially "knock out" the inside shapes to create the inverse of the image? This would have been easier if it where a simplified vector, but it is not. Client only has a flat image.  
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