I'm trying to invert a .PSD image from a white to a black base using lab colour mode. I can do this using a duplicate of the background image for LAB Inversion and then a duplicate for Lightness but when I do it also inverts my colours, e.g red becomes green. I'm using Photoshop cc, colour mode is prophoto, 16bit. I've been following a webinar series by Harold Davis called Photographing Flowers for Transparency. Part 4 gives a stap by step guide for this which I've followed very carefully but the problem persists. Can anyone please advise me.
In LAB, use an adjustment curves layer and just invert the end points of the lightness curve. Or use a invert adjustment layer and use luminosity as the blend mode.
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