Why not simply convert monochrome negatives using Photoshop?
As we have illustrated before, the assumption that a color negatives orange mask is to blame for inferior conversions in Photoshop is wrong. Any such mask can be removed easily enough. What really is to blame for the inferior quality in inverting negatives using Photoshop are wrong calculations. Photoshops invert command will subtract the value that is to be inverted from the maximum value possible. For this method to be correct the negatives intensities would have to be additive which they are not. What is additive instead for photographic film are densities. Assuming we are working with a linear scan in Photoshop the invert command is being applied directly to intensity values, while it should be applied to density values instead. The addition / subtraction of such density values equals the multiplication / division of intensity values. What this boils down to is that Photoshop subtracts where it really should divide. If you are interested in a complete mathematical analysis of this
