Several studies in the past have proposed models to characterize the colorimetry of displays, most of which have poor performance for OLED displays. This is primarily due to the dependency of the colorimetry of OLED panels on the Average Pixel Level (APL) of the content displayed on them. In this study, a workflow is proposed to characterize the colorimetry of APL dependent OLED panels based on the power consumption of actual pixel-content of the displayed scene. The method performed well with a mean of mean CIEDE2000 of 19 natural images as 2.18 units.