Provided are an image device and method for operating the device. The image device includes a memory, a first image processor configured to receive image data that includes first and second sub-data, perform first image processing, and write a result of the first image processing to the memory, a second image processor configured to read the first and second sub-data, on which the first image processing has been performed, from the memory, and perform second image processing that is different from the first image processing, and a controller configured to control the second image processor to read the first sub-data, on which the first image processing has been performed, from the memory, before the second sub-data, on which the first image processing has been performed, is written in the memory, after the first sub-data, on which the first image processing has been performed, is written in the memory.