Abstract
One of the key operations performed on a digital camera is to map the sensor-specific color space to a standard
perceptual color space. This procedure involves the application of a white-balance correction followed by a color
space transform. The current approach for this colorimetric mapping is based on an interpolation of pre-calibrated
color space transforms computed for two fixed illuminations (i.e., two white-balance settings). Images captured
under different illuminations are subject to less color accuracy due to the use of this interpolation process. In this
paper, we discuss the limitations of the current colorimetric mapping approach and propose two methods that are
able to improve color accuracy. We evaluate our approach
on seven different cameras and show improvements of up to
30% (DSLR cameras) and 59% (mobile phone cameras) in
terms of color reproduction error