The OneSpan Image Generator SDK generates standard black and white QR codes and Cronto images from a string value.
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QR Code | Cronto Image |
The Image Generator SDK package includes the following:
ImageGeneratorSDK.jar for Java platforms
ImageGeneratorSDK.dll for .NET platforms
The Image Generator SDK can be used on a variety of devices and supports the following platforms:
Image Generator SDK Java edition: Java-enabled platforms (JDK 1.8 and later)
Image Generator SDK .NET edition: .NET 6 and later
Supported image formats
QR code
A QR code is a two-dimensional bar code. It is composed of black modules (square dots) arranged in a square grid on a white background. The QR code is defined as an ISO (ISO/IEC18004) standard.
Cronto image
A Cronto image is a specific visual cryptogram which is composed of four components:
An image that consists of several squares (e.g. 25 x 25 squares), and each square has a specific color. The colors used are white, red, green, or blue.
A black border with a width of two squares.
A quiet zone outside the black border with a width of at least two squares.
A quiet zone inside the black border with a width of one square.
The data starts from the top-left corner downwards and proceeds by columns; a Cyclic redundancy check checksum is added for error detection.