Adobe Community: How to "reverse-engineer" corner radius value?

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1. Just_A_Mac_Guy,

Aug 30, 2012 9:23 AM in reply to sPretzel

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Select the arc of one corner with the white arrow tool. copy/paste a duplicate arc. Measurement bar or Transform palate will give you the width/height, which assuming there was no rotation, is the value of the corner radius.

Hope that make sense...

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2. sPretzel,

Aug 30, 2012 9:40 AM in reply to Just_A_Mac_Guy

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Hello Just_A_Mac_Guy,

Thanks for the tip. I did try it with a new box created with the Rounded Rectangle Tool and your method gave me the correct corner radius (H=W=corner radius I entered at creation). However, with the box I intended to do the measurements with in the first place, I obtain two slightly different readings for H and W.

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3. Jacob Bugge,

Aug 30, 2012 11:11 AM in reply to sPretzel

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sPretzel,

Are you sure nothing was done to the rounded rectangle, such as a change of width/height or an uneven scaling?

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4. Just_A_Mac_Guy,

Aug 30, 2012 3:36 PM in reply to Jacob Bugge

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I suspect, as Jacob does, that the rounded corner box was scaled unevenly so that the width does not equal the height. No way to tell the original radius, I am afraid, so use which ever one is more pleasing. You can also pull a round circular box as a trial. Then use half the diametre.

I had mentioned rotation because if the arc was rotated, the demensions would not give the true radius.

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5. sPretzel,

Aug 30, 2012 11:32 PM in reply to Just_A_Mac_Guy

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Hello.

I don't believe there had been any modifications made to the box, except perhaps even scaling (H & W). However, I am not sure. The difference between H and W is around 0.001". In any case, Just_A_Mac_Guy's tip is very useful. It's probably wiser that I use the Rounded Corners FX next time!

Thanks.

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6. Jacob Bugge,

Aug 31, 2012 1:59 AM in reply to sPretzel

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sPretzel,

The difference between H and W is around 0.001".

That is too much to be just the inherent accuracy (which is no more than about 0.001 pt), so something must have been done/gone awry.

You could also use the Effect>Convert to Shape>Rounded Rectangle (setting the Extra width/Height to 0). That would ensure that no change is made to the corner radius. You may Object>Expand Appearance at any time, to see the radius or to enable rotation and so on.

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How to "reverse-engineer" corner radius value?

Aug 30, 2012 9:15 AM

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