During the process of transmission and duplication of color images among the digital imaging devices, it is necessary to use color management to ensure the accuracy and the consistency of color restoration. One of the key technologies of color management is colorimetric characterization for digital imaging devices. According to the principle of colorimetric characterization of digital imaging device, the non-linear relationship between the RGB of digital imaging device and the CIE Lab of standard colorimetry value is established by means of polynomial regression method. Meanwhile, under Matlab software programming, a fast modeling software has been designed for colorimetric characterization of digital image processing devices. The experimental result shows that the software could realize a fast and precise conversion from RGB colorimetry value to the CIE Lab standard colorimetry value.