Re: [Gimp-developer] Gimp from git Gegl Gaussian Blur and Unsharp Mask useability issues

["Joao S. O. Bueno" <gwidion mpc com br>]

On 4 December 2013 19:50, Teo Mazars <mazarst ensimag grenoble-inp fr> wrote:
> > This Gaussian blur slider range doesn't really allow slider selection
> > of
> > small, precise values less than 1, so typing in values is still
> > necessary. A logarithm-type scale might be better than a linear scale
> > as
> > the useful range for blur necessarily is large, and the larger the
> > image, the larger the useful range.
>
> [...]
>
> > The other gegl_chant_double_ui values are pretty obvious. What does
> > the
> > value "1.5" do?
>
> The "1.5" is the UI exponent you were asking for in Gaussian Blur, 1.0 is linear. If 1.5 is not enough, you 
> may try 2.0 or larger. For the slider step problem, I don't know much about that sorry... I think the new 
> UI values you suggest are good. So please, try some more by tweaking the exponent and you can commit 
> directly to GEGL master those changes, if you want.
>
> > A way to type in values without risking accidentally causing a very
> > large radius operation would be very welcome.
>
> Agreed, I am not sure how to solve that though...
>
> > I wonder what values other people might find useful for Gaussian blur
> > and USM? I have a 10MP camera. Someone with a 30 or 40MP camera
> > probably
> > would need a larger range, which is one reason why user-settable
> > ranges
> > might be a nice feature. Different styles of processing would be
> > another.
>
> I agree too, but this is also an UI problem and I am really not an expert. A reasonable arbitrary UI range 
> + exponent is already a step forward.


What if we can think of a way of hint up values for the UI, but not
constrain the operator values themselves by these values - so that one
could make a 2000-radius gaussian blur, if really needed?
(despite any UI changes themselves to allow suitable ranges depending
on the image size
for certain controls? - (brush radius and gaussian blur come to mind) )



> Thank you,
>
> Téo
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