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• Wrapping image around cylinder with specific radiu...

# Wrapping image around cylinder with specific radius

New Here ,
Jan 28, 2023 Jan 28, 2023

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Hello!

I am trying to wrap a qr code image around a cylinder. The problem is that I want to specify a specific radius related to the size of the QR-Code. For example I want to recreate the same distortion that would happen if I had a 14mmx14mm size qr code posted on a cylinder with 12mm of radius.

I have no idea if photoshop allows to use real life measures or if I should use pixels as measure instead (e.g. 140x140 pixel qr code posted on a cylinder with 120 pixels radius). Any help is welcomed since I'm really struggling to wrap my head around it.

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2 Replies 2
LEGEND ,
Jan 28, 2023 Jan 28, 2023

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c=2*Pi*r --> 2*3.1458*12 mm ~ 76 mm

None of your measurements make any sense for wrapping a label around a cylinder of those radii. You need to literally do your math homework. The rest is merely a matter of correlating the pixels to physical units by setting correct DPI, which may not even matter, depending on the use case.

Mylenium

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New Here ,
Jan 28, 2023 Jan 28, 2023

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I don't understand when you say my measurements don't make sense, so here is a picture of the real 21mmx21mm (it's 21mm not 14mm my mistake) posted on a 12mm radius cylinder:

What I want is to recreate this distortion using photoshop. Also regarding the circumference I don't see any option on photoshop to either specify radius or circumference? Image below:

I'm sorry if I wasn't clear, if there any more things that I need to clarify please tell me! Thanks