1. A method for imaging margins and dimensions of solid tumor tissue located in an area of interest, comprising: a. illuminating the area of interest with a source of electromagnetic radiation (emr) containing wavelengths of emr absorbed by a dye; b. obtaining a video signal of the area of interest as a sequence of frames and processing the sequence of frames into an averaged control image, wherein the image is a series of pixels; c. administering the dye by bolus injection into vasculature circulating to the area of interest; d. obtaining a series of subsequent frames of the area of interest over time and processing the series of subsequent frames into a subsequent averaged image, wherein the image is a series of pixels; e. comparing each subsequent averaged image with the processed averaged control image to obtain a series of difference images; and f. comparing each difference image for evidence of changed absorption within the area of interest which is the outline of solid tumor tissue, whereby tumor tissue is characterized by faster absorption of and longer retention of the dye.