Recording apparatus and data processing method

A data processing method for processing recording data in a recording apparatus that uses an ink-ejecting recording head and performs recording by ejecting black ink and at least one color ink onto a recording medium from the recording head, comprising:

• an extraction step for extracting, on the basis of data for recording, both black adjacent pixels composed of pixels whose adjacent pixels are recorded with black ink, and color adjacent pixels that include pixels whose adjacent pixels are recorded with color ink, from among the pixels constituting a black image;
• a data creating step for creating data that corresponds to color ink so that recording with black ink and with color ink applied (or added) according to a given ratio is done, on the black adjacent pixels or the color adjacent pixels extracted in the extraction step;
• and
• a recording control step for performing recording with the recording head on the basis of the recording data and the data created in the data creating step,
• wherein the black image is recorded by superposing an image composed of pixels formed by black ink and an image based on the data corresponding to color ink created in the data creating step, and
• the data creating step creates data that corresponds to color ink by increasing the ratio for recording pixels with color ink onto the black adjacent pixels to be greater than the ratio for recording pixels with color ink onto the color adjacent pixels.