1. A coloring method for executing a multichannel MRI imaging, the method comprising: imaging a plurality of (M-channel) MRI images while varying conditions for a sample such as a tissue sample for which colors can be determined and for which MRI imaging is possible; subjecting data on said M-channel MRI images to a first independent component analysis (ICA) to decompose the images into L (L&lE;M) independent component images; selecting N points on the sample to create a training sample that is a set of L independent component image luminances and color components; using said training sample to generate as many transfer functions as the color components which output one color component for an arbitrary combination of the L independent component image luminances; for an object for which colored MRI is to be generated, imaging M′-channel (M′&gE;L) MRI images while varying the conditions; performing a second independent component analysis for the data on said M′-channel MRI images to generate L independent component images; calibrating said second independent components so that said second independent components equal to those of said first independent component, and applying the transfer functions obtained using said training sample, to said calibrated independent component images to obtain a color image.