The colors of a print as a target are easily and reliably equalized with the colors of a proof generated by a proofer. A printed color chart Cpa is colorimetrically measured by a colorimeter, and an original printing profile as a target for converting CMYK image data into colorimetric data is produced. Then, using the original printing profile and a printer profile, a color chart Cpa' of the proof is outputted from a printer based on the CMYK image data. The color chart Cpa' is colorimetrically ...

This image reproducing method comprises the steps of preparing profiles that are respectively set to correspond to an input device and an output device to be used and are employed for correcting MTF (Modulation Transfer Function) characteristics; processing image data fetched in through the input device by means of the profiles; then subjecting the image data thus processed by the profiles to predetermined image processing; processing the image data thus subjected to the predetermined image proc...

An adjustment process for converting the dot gain of printing conditions of a given standard printing profile to the dot gain of printing conditions of a printing machine which is going to be used is facilitated. For example, with respect to the color cyan C, the printing profile is divided into a linear four-dimensional LUT for color conversion and a gradation characteristic inherent in the printing profile, i.e., an LUT of dot gain characteristics. The characteristic of an inverse function of ...

A display apparatus displays on a two-dimensional basis or a three-dimensional basis points within an L*a*b* space associated with lattice points of a CMYK color space.

A color reproduction characteristic display apparatus displays a color chart. When a mouse cursor is placed on any one of a plurality of color patches constituting the color chart, there are displayed a coordinate value in a CMYK color space associated with the color patch designated by the mouse cursor and a color difference to determine two coordinates on a color space of L*a*b*, said two coordinates being associated with the coordinate value and two sorts of devices as well.

A conversion table is generated for converting image data D to be processed by a first device into image data D' to be processed by a second device for thereby generating a proof. The conversion table saves an area percentage of an image of black produced from only the image data K by the first device, at the image data K=0% or 100%. Using the conversion table, the image data D is converted into the image data D' to generate a proof with the area percentage of black being saved.

For converting color data to be processed by a first device into color data to be processed by a second device, using a color conversion table, a constraint condition is set between the color data, and a color conversion table between at least portions of the color data is generated according to the constraint conditions, whereas a color conversion table between remainders of the color data is generated in calorimetric association therewith.

A color conversion definition correction apparatus corrects a color conversion definition defining a relation between first color data representative of a color by coordinates on a first color space and second color data representative of a color by coordinates on a second color space in such a manner that a plurality of first color data has a one-to-one correspondence with a plurality of second color data. A smoothing processing is applied to the second color data. A color difference between th...

Even if the color of a print sheet to be actually used for printing is lighter than the color of a sheet according to a given standard printing profile, a printer outputs a proof on a dedicated sheet where the difference between the sheet colors has been corrected. Specifically, after input image data are converted to colorimetric data by a printing profile, the difference between the sheet colors is corrected by one-dimensional LUTs. Input/output gradients (straight lines) incorporated in the o...

The present invention selects color materials for a virtual device from real color materials, adjusts a gray balance to obtain a predetermined black color at a maximum device value by using selected color materials, assigns a color material amount to each device value so that a relation between the device value and brightness becomes linear when outputting gray, and evaluates a color range reproducible by the virtual device with the assigned color material amount by an inclusion rate for a stand...