Patent ID: 7832825

Claim:
An image-forming apparatus that uses a nozzle error correction method, the image-forming apparatus comprising: a full-type head having a plurality of nozzles disposed in series, as a single line of nozzles, to fit a paper size, wherein the full-type head has a fixed position and during printing, does not move with respect to the paper, in the longitudinal direction of the single line of nozzles; an error nozzle detection unit for detecting from the plurality of nozzles disposed in series, a position of an error nozzle firing an ink amount that is different from a reference value; a decision unit for determining from an input image, whether a current pixel for output is an output error pixel of the error nozzle, and determining whether an error pixel exists in a certain area around the current pixel; a color correction unit for setting a channel value of the error nozzle to a certain value, adjusting an ink amount fired by a surrounding nozzle on the same print head as the error nozzle, thereby adjusting a value of a pixel in the certain area around the current pixel to be closer to a value of the error pixel, without diffusing the error value of the error pixel to the pixel in the certain area around the current pixel, if the current pixel is the error pixel using the error nozzle, and if the current pixel is not the error pixel and an error pixel using the error nozzle exists in the certain area around the current pixel, adjusting an ink amount fired by a surrounding nozzle on the same print head as the error nozzle based on error information, thereby adjusting a value of the current pixel to be closer to the value of the error pixel, without diffusing the error value of the error pixel to the current pixel; an image-processing unit for performing image processing in order for the current pixel to be outputted, wherein the surrounding nozzle is at least one of the plurality of nozzles disposed in series.