A device, and associated method for image processing. An image area is divided into a plurality of image data blocks. Each of the image data blocks is compressed and stored in a data storage. Before an image is displayed based on the stored data, at least one of the image data blocks is selectively fetched from the data storage. After fetching the image data block, the image data block is decompressed. The image is displayed based on image data included in the fetched image data blocks. Modification to the boundaries of the image area is made by means of the selective fetching without modifying the image data stored in the data storage.