1. For a plenoptic imaging system comprising imaging optics, a microlens array and a sensor array, the sensor array including a plurality of subarrays of different color sensors, a method for generating real-time color preview images, the method comprising: accessing a plenoptic image captured by the plenoptic imaging system, the plenoptic image including superpixels corresponding to the microlenses in the microlens array and also including different color channels captured by the subarrays of different color sensors; for a principal color channel, determining pixel values for that principal color channel at centroids of the superpixels, said pixel values in the aggregate forming a principal color center view; for each of the other color channels: determining color ratios of that color channel to the principal color channel at centroids of the superpixels; and determining pixel values for that color channel by multiplying said color ratios with the pixel values for the principal color channel, said determined pixel values in the aggregate forming a center view for that color channel; and combining the center views of the different color channels to create a color preview image.