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  • "Smoothing" edge of lasso tool selection

    From Charlie Roberts@21:1/5 to All on Fri Aug 14 13:55:23 2020
    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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  • From Arthur T.@21:1/5 to Charlie Roberts on Fri Aug 14 18:51:17 2020
    In Message-ID:<6mjdjfd5fq34r8gr27virf81pas84rb923@4ax.com>,
    Charlie Roberts <croberts@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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  • From Charlie Roberts@21:1/5 to All on Sat Aug 15 13:34:13 2020
    On Fri, 14 Aug 2020 18:51:17 -0400, Arthur T. <arthur@munged.invalid>
    wrote:

    In Message-ID:<6mjdjfd5fq34r8gr27virf81pas84rb923@4ax.com>,
    Charlie Roberts <croberts@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.

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  • From RR@21:1/5 to Charlie Roberts on Sat Aug 29 18:02:04 2020
    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.

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  • From Charlie Roberts@21:1/5 to invalid@example.net on Tue Sep 1 12:20:04 2020
    On Sat, 29 Aug 2020 18:02:04 -0400, RR <invalid@example.net> wrote:

    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.

    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.


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