Camera Raw: Tone Curve before Post Crop Vignetting issue

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  • Updated 5 years ago
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The 'Post Crop Vignetting' effect in ACR affects the image after Tone Curve is applied. It seems the opposite would be more logical. I.e. Tone Curve applies on top of any other adjustment in ACR. Currently there is no way to maximize the dynamic range in ACR if Post Crop Vignetting is used. In order to do so, a adjustment layer is needed in PS.
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Luc Busquin

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Posted 5 years ago

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Steve Sprengel, Champion

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Post-Crop Vignetting is used to ADD A VIGNETTE EFFECT to an otherwise processed photo, so it makes sense to me that PCV is done after other adjustments have been applied.

A typical use of PCV is to add a black or a white border, and this needs to be done after other adjustments otherwise those other adjustments might prevent the clipping to black or white.

Your criticism might be valid if you were referring to the regular lens-correction vignetting-correction that is supposed to even things out across the original field-of-view and would seemingly need to be done before the Tone Curve adjustments.
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Luc Busquin

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I see PCV more as a tool to add a radial gradient than a tool to add a white or black border. I'm aware of the difference between PCV and lens corrections vignetting.

If curve came after PCV, it would still easily be possible to achieve clipped black or white border by adjusting curve.

It is currently impossible to achieve certain effect (in ACR) because of this. If curve came after PCV, there would be more creative possibilities not less. What creative possibilities would be loss if curve came last?

Also it seems PCV is even applied after the histogram is calculated. So PCV makes the histogram and clipping warnings inaccurate. I think that's the biggest problem, PCV can clip your image with no warning.
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Rob Cole

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You can use a radial gradient instead of PCV to have adjustment factored into histogram etc. (Lr5+).
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Eric Chan, Camera Raw Engineer

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Also, you should try the different Style options of the global post crop vignette feature. Highlight Priority and Color Priority in particular behave very differently than Paint Overlay.
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Luc Busquin

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Eric, thanks for pointing out the different behaviors in PCV. I'll stick to highlight priority from now on.