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I am wondering if there is a way to make GIMP (2.8 on Mac) allow me to make a rectangle with rounded corners - the radius being over 100 px. This seems to be the current limit.

This would greatly help me make great looking iOS app icons.

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The functionality is buried in GIMP in a function called gimp-image-select-round-rectangle. See the bug report.

I have exposed gimp-image-select-round-rectangle's ability to create rounded rectangles with a radius > 100 (actually up to 262144 pixels now) to the UI with a script-fu script, select_round_rectangle.scm The script also exposes the ability to create rounded rectangles with different x & y radii.

enter image description here

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Having read and responded to the above, I went hunting and have found that under the Filters menu at Filter->Decor->Round Corners... we have the ability to clip the image as desired, setting the radius as desired.

I note that you seem to be restricted to RGB, and a single layer image to be able to use this filter. Even then it doesn't always seem to be enabled. In any case it works for me.

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The radius in the Select -> Rounded Rectangle dialog in Gimp 2.8 is actually a percentage. It wouldn't make sense for it to go over 100 percent.

At least, this is the case for me on Gimp 2.8.2/Windows.

Personally, I prefer a little bit more control so I do this kind of stuff in Inkscape, an SVG-based vector editor. I can still then export to GIMP.

Edit: So it turns out there are two different places where you can create a rounded rectangle.

  1. Using the select tool on the toolbar, before making the selection, check "Rounded Rectangle" in the tool options. Here you can make a radius only up to 100 pixels.

  2. By making a normal rectangular selection, and then going to the "Select" menu, then "Rounded Rectangle". This allows you to round the rectangle you've already selected by a certain percentage, where 100% is the maximum amount of rounding possible on that selection (50% of the smaller dimention of the selected rectangle).

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So... There's a cap on how rounded my rectangles can be? I'm trying to get an iOS app icon with rounded corners that match the ones forced on be the system. –  Undo Jan 9 '13 at 14:37
    
No, no cap. 100% means that it's as rounded as it can possibly be. The percent sign means that it isn't measured in pixels, percentage is a measurement where "100%" is the maximum, meaning the diameter is the same as the smaller dimension of your rectange. 100% on a square would turn it into a circle, for instance. You can't get any more rounded than it. Perhaps I've misunderstood your question, or what you want to do - if so could you add an example of what you want to achieve to your question? –  thomasrutter Jan 11 '13 at 0:03
    
I can't speak for the Windows version, but on the Mac that field is NOT a percentage. Hovering over the field reveals a tooltip stating "Radius of rounding in pixels". I too would like to setup a radius > 100 pixels for the purposes of creating an iOS app icon. –  PKCLsoft Jun 2 '13 at 0:27
    
I have a hard time believing they would implement it differently for the Mac. Do you have a screenshot? Here's the relevant page of the documentation saying it's a percentage: docs.gimp.org/en/script-fu-selection-rounded-rectangle.html –  thomasrutter Jun 2 '13 at 4:03
    
Sure, here's a screenshot at: link –  PKCLsoft Jun 2 '13 at 13:09
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