Methods and systems used to associate color calibration profiles with
scanned images based on identifying the marking process used for an image
on a substrate using spatial characteristics and/or color of the image.
Image types which are classified and identified include continuous tone
images and halftone images. Among halftone images separately identified
are inkjet images, xerographic images and lithographic images. Locally
adaptive image threshold techniques may be used to determine the spatial
characteristics of the image.