A technique is provided for efficiently executing image processing operations such as code editing on a specific region of an image in an image processing apparatus for processing encoded image data such as JPEG 2000 encoded data that have a structure enabling data processing in image region units. Each of the multiple test boards receives partial test data from data channels of the LCD driver, and processes the partial test data to obtain a partial result; and each of the multiple test boards shares a partial result determined from corresponding partial test data with one or more others of the multiple test boards. The decorative relief can include both positive and negative design features and can be either simple or complex in appearance. It is yet another object of this invention to provide a gutter attachment that screens out debris from water prior to allowing water to enter the water barrel; said debris can be easily cleaned without removing the attachment or disturbing the barrel.