Make the barcode art at 42 dpi resolution, and the tattoo will only be 1.6 inches wide. The barcode for my initials "SDB" is only 68 units wide. A good option would be a short three-letter barcode. Your custom phrase can include numbers, spaces, and even punctuation! Choosing a tiny phrase will allow for narrower codes.
BARCODE TATTOO CODE
There is another barcode language used throughout the world that can encode letters called the Code 128 style. Looking closely at the UPC barcode there are 35 black bars, 33 white bars, and all the lines come in three different widths. I would suggest making all UPC style tattoos between 2.26 and 2.5 inches wide. Most barcode scanners maximum input area is 2.5 inches, so any line pattern bigger than that will not fit into the red laser eye. They must be made larger to have any chance of scanning, but do not make the image too big. Most barcode tattoos I have seen are between 1.5 and 2 inches wide, not quite big enough.
This is about double the normal size we are used to seeing these codes at the store. So a skilled tattoo artist, using one needle in their gun, should make all UPC style barcodes at least 2.26 inches wide. To figure out what the minimum size UPC tattoo should be, divide 95 units, by 42 dpi, and you get 2.26 inches. Every Universal Price Code is a standard 95 units wide. Moving on to the most common type of barcode symbology, the one found in most supermarkets, which is also being used extensively for tattoo art is the UPC. Selecting a flat surface on the back will also make it easier to scan the barcode.
Certain parts of the body like the shoulders and back do not expand as much. Barcodes are a combination of black and white bars, if the black ink expands too much, it can ruin the white areas. It is worth mentioning that tattoos do change with age, they all slowly blend out over time, and that will effect the accuracy. Therefore the original barcode artwork must be made at 42 lines per inch or lower to translate properly into a tattoo. To calculate the minimum resolution, I divided 300 by 7 which equals 42 dpi. Sampling a one-inch square at 300 dpi, I measured the width of a single needle line. I digitized a two-month old tattoo directly on a flatbed scanner.
BARCODE TATTOO SKIN
There are several factors to consider when tattooing the computer generated symbol, like the DPI of skin and how many lines are in a barcode, but I believe with precision it can be done. Most barcode tattoos try to cram too much information under skin, and eventually the ink blends into a black blob. There are some fine examples of tattooed lines and numbers that look like the ubiquitous symbol, but the true test for any barcode is does it make the scanner beep.
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