1. An image processor configured for providing a user a dynamic zoom functionality, comprising: an input unit for receiving sub-image information specifying a spatial sub-image of a global image, the sub-image information including a pan information and/or a zoom scale; a suppressor configured to suppress only in the sub-image, spatial frequency components (or bands) below a dynamic lower frequency band limit thereby producing a spatial frequency modified sub-image wherein the frequency modified sub-image is produced by the suppressor upon the input unit receiving the sub-image information; an output unit adapted to output for display on a screen the frequency modified sub-image at the specified zoom scale, the image processor thereby affording a zooming into the global image at an image portion thereof corresponding to the pan information.