method of superimposing one image on another, method of personalizing a data carrier using the image overlay method and a personalized data carrier. a method of superimposing a first image on a second image, in which each image is defined by a plurality of pixels, is disclosed. the method includes changing target pixels of the second image corresponding in position to pixels of the first image to be overlaid on the second image. changing target pixels in the second image includes changing the values of some of those pixels in the second image to their new values. each new pixel is based on the original value of at least one pixel from the original image. a personalization method including an image overlay method and a data carrier, thus personalized, are also disclosed.
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