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I developed this QR code for my business, and I went with a gray/pink color pallete rather than black and white for aesthetics.

QR Code example

Based on my experimenting with my monitor (iMac) and QR reading app (Red Laser) I can read the code successfully - but it is hard to know if it will work with a variety of displays and readers based on this one test. Is there some numerical guidance of contrast or color choices that are generally gaurenteed to work for any combination of display/print and reader?

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There's more to it than just the contrast. 1. QR code size 2. Scanning distance 3. QR code data amount 4. Error correction level 5. The affect of customization ( like a company logo in the middle ) 6. Print material 7. Cr code reader ( By far the best reader I've tried i-nigma.com/downloadi-nigmareader.html ) –  Joonas Jan 13 '13 at 22:25
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2 Answers

up vote 3 down vote accepted

QR Codes are pretty robust. According to this article, "QR readers begin to have difficulty reading codes below a ratio of 4:1".

Plugging the color values of your provided QR Code into the tool linked in that article, you have a contrast ratio of 2.74:1. However, the two applications I have on my phone were both able to read your code, so this isn't an exact science we're dealing with.

Another consideration is the size of the QR code. I have tested this before; I was able to read codes down to 13mm. 12mm would not scan no matter how long I waited. 13mm would scan but not right away if I recall. 15mm seemed to be a safe choice:

QR Code test sizes

Since you have this tagged under web-standards, I assume that this will be displayed on a web site. It is difficult to translate metric units to screen units, but hopefully this gives you some guidance.

If it's going to be on a web site, why not make the QR Code a hyperlink to what the code resolves to? If it's not going to be a hyperlink, perhaps set the decoded text as the alt text. It's always nice to have a fail-safe.

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A great answer thank you. I actually originally tagged this "color-theory" as I will sometimes print the QR and sometimes display it digitally, but I will nonetheless make use of your feedback for the digital presentations. –  IcingOnThePaper Jan 15 '13 at 2:11
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i think it depends on apps...so therefore, try finding out about the most used free apps that people use and test it out manually with normal phones. Not with 8 MP camera.

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