Photoshop: Ability to increase opacity of layer beyond 100%

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I'm missing the possibility to raise the opacity of a layer to more than 100%.
Sometimes, if I paint a shadow or some other details, I want to add just a little bit more. Now I'm solving this by duplicating layer and lower the duplicated layers opacity to preferred look.
Same for adjustment layer, a quick doubling of your curves adjustment layer could then be done by adjusting opacity to 200%.
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johan groth

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Posted 4 months ago

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christoph pfaffenbichler, Champion

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The request does not seem to make sense to me as of necessity 100% is the maximum opacity. 

If you wanted to edit the transparency (sometimes also called »alpha«) of a Layer (with Adjustment Layers or Smart Filters) independently from the pixel’s RGB-(or CMYK- or Lab-)values that would seem to be another issue. 

Another workaround could be applying Layer > Layer Mask > From Transparency and the editing the Layer Mask (with Curves for example). 
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johan groth

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Thanks for reply, what I mean is if you paint with a brush in 25% opacity on a layer in 100%. You can't change that brushstroke later on to be 50%.
Unless you duplicate the layer.
If there was a possiblity to adjust the layers opacity to more than 100% this would be much easier and prevent a messy layer structure.
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christoph pfaffenbichler, Champion

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Like I mentioned one can already edit the transparency of a Layer as a Layer Mask. 
That’s probably considerably less convenient than your current approach but both run a slight risk of banding due to quantisation. 

And if you are talking about simple one-colored Brush Strokes the Layer Style Drop Shadow would provide another option. 

In any case I think you should rethink your terminology – if more than 100% Opacity were an option what would people expect to happen to parts of a Layer that are already completely opaque? 
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johan groth

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yes, I know about editing the transparency with layer mask, but it's only possible to lower the opacity(from 100%). Or have I missed a new feature?

Yes, maybe the terminology is confusing, but the idea that the opacity could be a maximum of 100 is a limit taken from the real world. In photoshop, opacity should be possible to raise above 100(since it's possible to duplicate layer).

If parts of layer that we're already opaque gets cranked up to over 100% nothing would happen, as simple as that.
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christoph pfaffenbichler, Champion

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yes, I know about editing the transparency with layer mask, but it's only possible to lower the opacity(from 100%). Or have I missed a new feature?
Not sure I understand you – one can change any pixel in a Layer Mask to anything  between 0% and 100% (or rather the corresponding integers between 255 to 0). 

I think you should change the wording you use on this and make a meaningful request concerning the edibility of Layers’ transparency separate from the pixels’ color values (maybe even non-destructively). 
To me calling that a Layer’s Opacity simply seems to confuse terminology.