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Print reads the complete image and shows its pixel values as text in a separate window. The first line gives the image's size: pixels, scanlines, samples (bands), bits and type.
Print is useful for looking at the values of small regions, such as the XYZ values from AccuColor. It is not practical for large regions, or for a whole image; use Crop first to select a small region.
Print passes the image on unchanged to any module connected after it.