KEYWORDS: RGB color model, Printing, Environmental monitoring, Color management, Color difference, Color reproduction, Image processing, Visualization, Time metrology, Data conversion
In current printing technique, the Color Management System uses the ICC profiles of monitor and printer to perform
color matching. Unfortunately the ICC profile cannot capture all of the monitor color reproduction characteristics,
because such features change when the user acts on the color temperature, brightness and contrast controls, and they also
depend on the kind of backlighting and lifetime of LCD monitor. As a result there is usually an unwanted color
difference between an image displayed on the user monitor and its printed version. Yet, once we are able to produce an
ICC profile that matches the user's monitor characteristics by measuring, then the CMS becomes able to correctly
perform color matching. However, this method is of difficult application, because in general the measuring equipment is
not available and, even then, it takes a long time and new measurements according to monitor color temperature,
brightness and contrast. In this paper we propose a color matching technique based on estimate of the user's environment
through the simple visual test with an output image on monitor and its printed image. The estimated characteristic of
monitor is stored in new ICC profile and applied to color conversion process. Consequently the proposed method
reduced the color difference between image displayed on user monitor and its printed image.
KEYWORDS: Printing, RGB color model, Calibration, 3D acquisition, CMYK color model, 3D printing, Detection and tracking algorithms, Color reproduction, Visualization, Inkjet technology
We propose a novel color mapping method that generates smooth color transition and can accommodate the color
preference. The method consists of two stages; rough calibration and black generation. The rough calibration process
generates a three dimensional (3-D) Look-Up-Table converting input RGB data to printable CMY values. When the 3-D
LUT is created, a new intent for color mapping, target color is internally used. The target color is predefined from a
reference color book based on the color preferences of testers involved in the target definition phase. All of the input
data of the 3-D LUT are mapped to the printable values in a printer based on the target color, and then simply converted
to CMYK values. We evaluated the proposed algorithm comparing with a commercial printer profiler and found that the
proposed algorithm makes better printing quality.
Recently, a variety of imaging devices are being used to represent electronic color images the reproduced color, however, is different from the original color because of the difference of producible colors on the devices. The range of producible colors offered by a device is referred to as its gamut. In his paper, a gamut-mapping algorithm (GMA) is proposed that can maintain device-independent color. Categorized as a parametric GMA, this algorithm utilizes variable anchor points to both reduce a sudden color change on the gamut boundary of the printer and to maintain a uniform color change during the mapping process. Accordingly, the proposed algorithm can reproduce high quality images with low-cost color devices.
Currently many devices reproduce electronic images in a variety of ways. However, the colors that are reproduced are different from the original color due to the differences in the gamut between devices. In this paper, an image dependent gamut mapping method is proposed. This method clips the chroma while compensating for the change of lightness caused by the lightness scaling required for a reproduction gamut. In this paper, the anchor point, which is the color center point in the mapping, is set at a lower point than the conventional mapping method. As a result, this reduces the difference between the original image on the monitor and the results on the reproduction device. Our mapping algorithm is applied to the gamut mapping between the monitor and printer. Consequently, the printer output image is highly consistent with the corresponding monitor image.
In a drop-on-demand thermal ink-jet printer, the dot size of an ink droplet expelled from printer depends on the absorption of the paper. This causes severe differences between output images on the different paper materials. In this paper, the color matching algorithm for different papers is proposed. To achieve corresponding color reproduction, dot gain compensation based on saturation was applied to predict color reproduction on printer. If the dot gain of pigment is increased, the white portion of paper decreases while the saturation value increases monotonically. As the result of dot gain compensation, intensity change may be appeared. Therefore, an intensity compensation without any hue variation is followed to match the colors of different substrates.
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