People
ask us every day about printing for QR Codes and what size is
advisable. We are going to explain it in very simple terms because
mistakes are made sometimes and we hopefully this articles will help you
overcome this.
To
print a QR code you must have the QR code in the correct format. Usually
for print Vector images are used as they can be scaled to any size. Use
a generator that provides images in vector format; Azonmobile's can
produce PDF, SVG and EPS vector formats.
In
case you would like to use our more advanced customization features like
foreground image or different styles the output will be a Raster.
Raster QR codes also can be printed but they have to be the right size.
Here is how to find out the minimum size the QR code has to be. Lets
assume that you will print at 300dpi (dots per inch) quality and the
size of the QR code when printed needs to be 1.5 inch in size:
1.5 x 300 = 450 pixels
In case you prefer the metric system and you need a QR code to be for example 4 cm (1cm is 0.394 inches):
4 x 0.394 x 300 dpi = 473pixels
If the print quality is 600dpi then you will need 900px for 1.5 inch code and so on...
Having
the necesary size in pixels of the QR code you can play with the “block
size” option of the generator to obtain the optimal result – an image
that is large enough. Dont forget that the error correction also impacts
the size of the QR code by affecting its complexity thus its size in
pixels – the higher the error correction – the bigger the code gets.
In
case the QR code has to be printed in very large size (for example on
billboard) you should go for a Vector format. Still if you want to use
the extra visual options provided by our generator for the raster images
you can still use raster format but you will have to generate a huge
image using much higher values for block size. For the Advanced and
Enterprise packages we do allow for block size upto 150pixels.
Important tips
->> The QR Code should not be smaller than 0.75 inch when printed as they may become unreadable on certain phones.
->>
Customized QR Codes usually should not be smaller than 1 inch when
printed. Go for a bit larger code in case you have your logo embedded so
it is visible.
->> Complex QR Codes that contain a lot of
data and have high error correction level may be hard or even impossible
to read on some devices. Consider this when you are creating a vCard QR
Code for your business card - do not fill too much data.
->>
Be aware that the colors that will go out from the printer may be a lot
different from what you see on the screen - this may consern the
overall visual effect of a Customized QR Code or impact the readability
of a colorful code.
->> Before you make the bulk print
order to your printhouse do few samples and ensure that the QR Code is
readable on the type of material/paper you print on. Test with as many
phones as you can and preferably not all top-of-the line models. Only
when satisfied with the result proceed with the printing. Always do
samples and check the readability on paper specially for customized QR
codes.
Article Source: http://www.compensationsecrets.co.uk/