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I am trying to adjust the curves in LAB space as per screenshot of photoshop command below:

enter image description here

I am using this method:

img = ColorConvert[ImageResize[
Import["https://images.unsplash.com/photo-1503803548695-c2a7b4a5b875"], 400], "LAB"];
{l, a, b} = ColorSeparate[img, "LAB"];
Grid[{Show[#, ImageSize -> 400] & /@ {img, ColorCombine[{l, 1.4 a, 1.4 b}, "LAB"]}}]

enter image description here

The results appear similar, but it seems like a bit of a naive workaround. Is this essentially equivalent, or is there a more correct way to approach the problem?

YouTube tutorial in photoshop for reference

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