"Smoothing" edge of lasso tool selection

[Charlie Roberts]

Just wondering if GIMP 2.10 has the facility to snooth out
the boundary of a selection made by the lasso tool.

I usually do not have a problem, but when trying to
select an object that the brain knows is curved, the
straight segments, even if they are short, look odd.
Furniture is a good example when there is a lot of
carving or otherwise curved edges.

I am wodering if there is a way running a spline fit,
or something like that to make the curves "smoother"
(or, to put it differently, have fewer discontinuities
in the fiirst deravative of the curve).

TIA.


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[Arthur T.]

In Message-ID:<6mjdjfd5fq34r8gr2...@4ax.com>,

Charlie Roberts <crob...@gmail.com> wrote:

>Just wondering if GIMP 2.10 has the facility to snooth out
>the boundary of a selection made by the lasso tool.

Have you tried the Foreground Select Tool or the Scissors Tool
(assuming they're still there in 2.10, which I'm not using).

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Arthur T. - ar23hur "at" pobox "dot" com

[Charlie Roberts]

On Fri, 14 Aug 2020 18:51:17 -0400, Arthur T. <art...@munged.invalid>
wrote:

>In Message-ID:<6mjdjfd5fq34r8gr2...@4ax.com>,
>Charlie Roberts <crob...@gmail.com> wrote:
>
>>Just wondering if GIMP 2.10 has the facility to snooth out
>>the boundary of a selection made by the lasso tool.
>
>Have you tried the Foreground Select Tool or the Scissors Tool
>(assuming they're still there in 2.10, which I'm not using).

No, I have not. I will give them a try.

The problem is with generic curves like in furniture (chair handles,
legs, etc.). For wheels (and other circular objects) I can get very
good results using the cirlce/ellipse selection toos, which solves
the problem for tires, wheels, etc.

Thanks for the hint.

[RR]

On 8/14/2020 1:55 PM, Charlie Roberts wrote:
>
> Just wondering if GIMP 2.10 has the facility to snooth out
> the boundary of a selection made by the lasso tool.
>
> I usually do not have a problem, but when trying to
> select an object that the brain knows is curved, the
> straight segments, even if they are short, look odd.
> Furniture is a good example when there is a lot of
> carving or otherwise curved edges.
>
> I am wodering if there is a way running a spline fit,
> or something like that to make the curves "smoother"
> (or, to put it differently, have fewer discontinuities
> in the fiirst deravative of the curve).

I can think of two things you can try.

(1) Grow the selection by X pixels, then shrink it by the same amount.
This tends to make the selection perimeter smoother. Experiment with
different values of X to get the result that works best for you.

(2) As an alternative, use the paths tool to create the selection
instead of the lasso tool. The tool gives you a lot of control, but it
takes a little more work to use. If you're not familiar with it already,
you might want to read the documentation and spend a little time
practicing using it.

[Charlie Roberts]

Thank you very much for both suggestions. I would never of
taught of the 'grow-and-shrink' technique!

I am a kind of familiar with the Path Tool. I mainly use it via
the text-to-path for geting some special effects for text.
But, I will explore the other aspects.