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Author Topic: Tone curve and luminance?  (Read 4514 times)
Schewe
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« Reply #20 on: November 17, 2012, 07:15:00 PM »
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In RGB, any curve applied on all three channels also changes the R:G:B intensity ratios per pixel, by nature,
mainly effecting saturation and at times also the hue.

But the Curve in LR/ACR is a hue protected curve...meaning it only impacts luminance and saturation (2/3 of the HSL potential). A normal tone curve in Photoshop does twist the hue, saturation and luminance. That's where the differences are. And again, Thomas did this on purpose. In my experience, when Thomas decides to something a certain way, he's usually right.
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Peter_DL
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« Reply #21 on: November 18, 2012, 02:20:27 AM »
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Curves in Luminosity blend mode in Photoshop, or in Lab mode, violate the R:G:B intensity ratios per pixel as well, and typically in a less favorable way compared to a RGB curve with hue-lock. We could say that these color models do not hold what they promise.  See S. Tindemanís  "exposure curves".

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Schewe
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« Reply #22 on: November 18, 2012, 03:32:46 AM »
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Yeah, so...the RBG mode Hue locked looks best to me. Seems Thomas isn't so wrong huh?
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