Hi David,
I agree, that the labels do not explain exactly what the sliders do: they
adjust steepness of a* and b* curves in Lab (and tooltips say just that).
The labels were supposed to make the tool approachable by less technical
users who don't know about Lab curves. But it's difficult to describe the
effect of a* and b* steepness in a label...
Moving sliders to the right doesn't change color balance, but increases
saturation of both colors (green *and* magenta, blue *and* yellow). Moving
sliders to the left desaturates both colors (green *and* magenta, blue
*and* yellow). Those are the effects for a color-neutral image, the actual
effect might be different. If an image is tinted blue, the effect is
different: moving the first slider to the right is more like "saturate blue
and magenta", rather than "saturate green and magenta". So color names are
just a mnemonics to distinguish them, but it's not always a correct
description. Referring to a* and b* steepness directly is more correct.
Thinking again about it, I note that while blue corresponds to small and
negative a* values, green corresponds to positive b* values. So reversing
the order of colors for one of the labels makes sense to me. I suppose that
changing "vs" to "and" may be helpful too: to indicate that we change a
pair of opposing colors, not one of them at expense of the other.
So I think that these two ways of labeling the sliders make sense:
1) "green and magenta", "yellow and blue"
2) "a* steepness", "b* steepness"
I don't know if (1) is really a usability improvement, though I like it.
On 21 October 2013 19:27, David Vincent-Jones <[email protected]> wrote:
> 'green vs magenta' ... slider to left vs slider to right ... intuitive
> 'blue vs yellow' ... slider to right vs slider to left ... UN-intuitive
>
> I suggest that the blue and yellow label names should to be reversed.
>
> David
>
>
>
>
> ------------------------------------------------------------------------------
> October Webinars: Code for Performance
> Free Intel webinars can help you accelerate application performance.
> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most
> from
> the latest Intel processors and coprocessors. See abstracts and register >
> http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk
> _______________________________________________
> darktable-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/darktable-devel
>
------------------------------------------------------------------------------
October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk
_______________________________________________
darktable-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/darktable-devel
