Rectangular select with circular and elliptical corners

Odinbc · **Posted:** Thu Jul 25, 2013 9:17 am **(#1)**

Rectangular select with circular and elliptical corners
I just noticed this brilliant new script at the Registry.
The uses are endless! :bigthup

Esper · **Joined:** Jul 17, 2012 **Posts:** 2769

i dont find this very intuitive

how does it work ?

Odinbc · **Posted:** Thu Jul 25, 2013 10:56 am **(#3)**

Open an image, 800x600 px.
Select all, Shrink selection 200 px, from border.
Select | Rectangle with circular corners.
Try each selection operation starting with, add to selection, using the following coordinates.

Now try it with an oval selection the full 800x600 px canvas size.
Shrink the oval selection by 100 px.
Try each selection operation using the same coordinates.

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4812

The difference with "Select/Rounded rectangle"?

Odinbc · **Posted:** Thu Jul 25, 2013 11:28 am **(#5)**

ofnuts wrote:

The difference with "Select/Rounded rectangle"?

The difference is the 100 radius limit of 'Select Rounded Rectangle'. The author has an explanation at the registry. The bugzilla link is worth a look as well.

RobA · **Joined:** Jul 14, 2010 **Posts:** 697

How about just jumping to quickmask, applying a blur, then threshold (or clamp levels) and out of quickmask.

Elliptical is possible using a blur with different X/Y values, and threshold (or levels) at values other than 50%

Voila, rounded corners on your selection.

If you want it smoother (i.e. for stroking) change the selection to a path first...

It's what I've always done.

-Rob A>

Rod · **Joined:** May 16, 2010 **Posts:** 16158

This is a great script for lazy folks such as myself though Rob.

Esper · **Joined:** Jul 17, 2012 **Posts:** 2769

@RobA: i tried it, and its quite an elegant technique !

RobA wrote:

How about just jumping to quickmask, applying a blur, then threshold (or clamp levels) and out of quickmask.

what are/is clamp levels ?

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

wow, i didn't know we needed a script to make a rectangular selection with
rounded corners! wow
With the current gimp selection tools I can create every shape i need, even a perfect circle with Rectangle select.
The main argument of the script author in his bug report is that limitation to 100 pixels doesn't work on big images. What's wrong with scaling up a selection using the Scale tool? Make rounded rectangle on a small scale then scale it up! This way we have 8 control nodes and real-time preview, with this script i can't see anything before i actually execute it.

Rounding corners by Ry and Rx is nice, but who needs such a precision?
Engineers would probably use AutoCAD, designer - AI or Inkscape, anyway.

BTW, in AI and Inkscape rounded corners with ridiculous 262144 px x/y values
doesn't make any sense. Both will throw you back to where it does make sense, 400 or so.

Esper · **Joined:** Jul 17, 2012 **Posts:** 2769

*wishes to have a camera, so he can show K1te a movie of Esper deleting the script from his Gimp folder*

:mrgreen:

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

Esper wrote:

*wishes to have a camera, so he can show K1te a movie of Esper deleting the script from his Gimp folder*

:mrgreen:

Does anybody know where I can get a script to make straight lines in gimp? :mrgreen:

RobA · **Joined:** Jul 14, 2010 **Posts:** 697

Esper wrote:

what are/is clamp levels ?

Just use the levels tool and slide the white and black in equal amounts rather than the threshold. It doesn't do too much in this case, but I will sometimes to this rather than threshold as threshold makes things jaggy (but if you convert to a path before stroking/filling then it doesn't matter).

An even easier technique for rounding all corners of a selection equally is to grow the selection by the desired radius, shrink the selection by 2x that, then grow it again by the desired radius.

The only caveat is that when growing or shrinking you might loose pieces of the selection depending on the source shape.

-Rob A>

Esper · **Joined:** Jul 17, 2012 **Posts:** 2769

RobA wrote:

An even easier technique for rounding all corners of a selection equally is to grow the selection by the desired radius, shrink the selection by 2x that, then grow it again by the desired radius.

mind blown :mrgreen:

Mokonafan · **Posted:** Fri Jul 26, 2013 3:15 pm **(#14)**

Esper wrote:

*wishes to have a camera, so he can show K1te a movie of Esper deleting the script from his Gimp folder*

:mrgreen:

HyperCam is a good option. :>