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LAB conversions

Explorer ,
Jul 10, 2020

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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.

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LAB conversions

Explorer ,
Jul 10, 2020

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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.

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Adobe Community Professional ,
Jul 10, 2020

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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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