Inverse of PixelCoordinate?

PixelCoordinate, a UtilityTransform, takes as argument a fractal coordinate z and returns the corresponding pixel coordinate.

Is there a similar transform that takes as argument a pixel coordinate and returns the corresponding fractal coordinate?

If not, I could write one.

I've written one.

Thanks! I've added your new transform (FractalCoordinate) to common.ulb and uploaded the new version to the formula database.