The present disclosure relates to improved different display capability based on sensed image data exchange between illumination device and method of non-linear. A handheld imaging device includes a data receiver configured to receive a reference encoded image data. the data comprises encoded reference by an external decoding system code value. the reference code value represents the reference grey level the reference gray level by using suitable for different light levels for spatial frequency of human visual perception nonlinear reference gray scale display function is selected. said imaging device further comprises a data converter which is configured to access a reference code value and code mapping device of the imaging device specific code values. device specific code values is configured to generate grey levels specific to the imaging device. code-based mapping a data converter configured to convert the reference encoded image data transcoding is device specific code encoding a value of a device-specific image data.