Alan,
I scan all of my C-41 as a positive file, and do the inversion in photoshop. I apply my scanner color correction profile to the initial positive image, and then invert it. A good place to start is to use either the levels adjustment in Photoshop. If you hold the ALT key while clicking the auto button, it will bring up a submenu where you can choose the algorithm. "Enhance Per Channel Contrast" is the same is if you were to set the levels for each RGB channel. You can set the amount of clipping for highlights and shadows respectively. "Snap Neutral Midtones" helps remove color casts in the mids. From there I set the gamma with the mids slider in the same levels adjustment layer. This gets you to the first image below. I then use the Color Balance adjustment layer to further dial it in. Finish with a curves adjustment gets you to the second image below. The rest is done with more selective curves layers and a plugin called "Lumenzia". This plugin allows you to dodge/burn specific tonal ranges.
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