Overview of the Image Generator SDK

The OneSpan Image Generator SDK generates standard black and white QR codes and Cronto images from a string value.

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.