Abstract: This invention is to correct a difference of dot gain between output devices. This invention for converting binary data for a first output device to binary data for a second output device includes the steps of: converting the binary data for the first output device to multi-value data; correcting the multi-value data so that an output density by the second output device becomes equal to an output density by the first output device; and converting the corrected multi-value data to the binary data for the second output device. As stated above, by carrying out the correction so that the output density of the first output device coincides with the output density of the second output device, the user can obtain the same output result without giving consideration to a difference between output devices.

Abstract: This invention is to correct a difference of dot gain between output devices. This invention for converting binary data for a first output device to binary data for a second output device includes the steps of: converting the binary data for the first output device to multi-value data; correcting the multi-value data so that an output density by the second output device becomes equal to an output density by the first output device; and converting the corrected multi-value data to the binary data for the second output device. As stated above, by carrying out the correction so that the output density of the first output device coincides with the output density of the second output device, the user can obtain the same output result without giving consideration to a difference between output devices.

Abstract: An object is to provide a print proof that takes account of halftone dots and operating conditions of a printing press. To achieve the object, a color image processing apparatus for producing the print proof comprises: a dot gain processing unit for receiving an input of halftoned binary image data, and for converting the binary image data to multi-value image data corresponding to the amount of dot gain of each color; a first color-converting unit for converting the multi-value image data to image data in a device-independent color space; a resolution converting unit for changing the resolution of the multi-value image in the device-independent color space to match the resolution of an output device; and a second color-converting unit for converting the multi-value image data, converted into the device-independent color space, to image data in a color space associated with the output device.