a recording apparatus of the electrophotographic system such as a laser beam printer is provided . an image processing apparatus which is connected between a recording control section and a recording mechanism section of such a recording apparatus is also provided . the apparatus comprises : an input unit for inputting image information of a density lower than a recording density of the recording mechanism section produced by the recording control section ; a memory to store the image information supplied from the input unit by an amount of a plurality of main scan lines ; a referring circuit to refer to the image information of a target pixel as a recording pixel and its peripheral pixels from the image information group stored in the memory ; a detector to detect that the recording pixel and its peripheral pixels form a part of a predetermined half tone pattern which is constructed by a plurality of pixels as a result of the reference by the referring circuit ; a converter to convert the image information of the recording pixel into the image information of a density which is at least equal to or larger than a recording density of the recording mechanism section in accordance with the result of the detection by the detector ; and a transmitting circuit to transmit the image information converted by the converter to the recording mechanism section .