The display profiling method with eyes and colormatching accuracy in soft proofing

Sugiyama, Tohru; Kudo, Yoshihisa

doi:10.1117/12.588065

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…In the case of CRT, the relation between input signal: [In] and brightness of displayed image: [Out] can describe equation (1). In using equation (1), a gamma of CRT can be predicted from a pair of input signal and brightness of displayed image, and the tone reproduction curve can be calculated from this gamma.…”

Section: The Tone Reproduction Curve Of Three Primary Colors (Red Grmentioning

confidence: 99%

The calibration accuracy of display white point by visual calibrator under various illuminations

Sugiyama

Kudo

2006

SPIE Proceedings

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We have developed a method to calibrate a display to a predetermined state and to make an ICC display profile by visual calibration for soft proofing. Our method adjusts a color of display white point to a color of a white object under a viewing illuminant, so our method can calibrate the display white point for any viewing illuminant. In order to calibrate the tone reproduction curve of a display, the brightness and hue of a continuous tone image is adjusted to the brightness and hue of a binary image. In addition, three pairs of images having different values of brightness are used. These methods can calibrate the display which has complex tone reproduction curve like LCD displays. In Electronic Imaging 2005, we reported that these methods can calibrate tone reproduction curves of LCD displays accurately 1 .In this paper, we evaluated the matching accuracy between display white point and paper white under various illuminances and color temperatures to bear out the effect of our method under practical illumination. We found from this experiment that the matching accuracy was almost the same in all illumination conditions. Furthermore, all subjects calibrated the chromaticity of display white point more bluish than the chromaticity of paper white in all illumination conditions, and the dispersion of yellow-blue direction was larger than that of red-green direction. This yellow-blue direction was almost the same as the long axis of MacAdam ellipse.We also evaluated the capability of color discrimination between display and paper in various illumination conditions. At 500lx or less, many subjects made judgments that the color of display white point was similar as the color of paper white when color difference between display and paper was small, but the correlation of color difference with judgement was small at 1000lx or more. The cause of these results is the maximum luminance of the display was darker than that of paper at 1000lx or more. These results suggest that ISO 3664:2000 P2 condition is appropriate to compare the image on computer display with that on paper at the same time.

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Section: The Tone Reproduction Curve Of Three Primary Colors (Red Grmentioning

confidence: 99%

The calibration accuracy of display white point by visual calibrator under various illuminations

Sugiyama

Kudo

2006

SPIE Proceedings

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“…[1][2][3][4][5] With a correctly calibrated and characterized workflow, according to color management principles, soft proofing should be straightforward. 4 Indeed, the colorimetric characterization of the monitor and the printing press should make it possible to predict accurately the monitor RGB values that will match any printed color, provided that the color gamut of the display is large enough.…”

Section: Introductionmentioning

confidence: 99%

Effect of time spacing on the perceived color

2007

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One of latest developments for pre-press applications is the concept of soft proofing, which aims to provide an accurate preview on a monitor of how the final document will appear once it is printed. At the core of this concept is the problem of identifying, for any printed color, the most similar color the monitor can display. This problem is made difficult by such factors as varying viewing conditions, color gamut limitations, or the less studied time spacing. Color matching experiments are usually done by examining samples viewed simultaneously. However, in soft proofing applications, the proof and the print are not always viewed together. This paper attempts to shed more light on the difference between simultaneous and time-spaced color matching, in order to contribute to improving the accuracy of soft proofs. A color matching experiment setup has been established in which observers were asked to match a color patch displayed on a LCD monitor, by adjusting its RGB values, to another color patch printed out on paper. In the first part of the experiment the two colors were viewed simultaneously. In the second part, the observers were asked to produce the match according to a previously memorized color. According to the obtained results, the color appearance attributes lightness and chroma were the most difficult components for the observers to remember, generating huge differences with the simultaneous match, whereas hue was the component which varied the least. This indicates that for soft proofing, getting the hues right is of primordial importance.

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“…So, we proposed other methods. [3][4][5] While looking at a color patch displayed on a monitor and that on blank paper, the observer can adjust the color rendition of the monitor to that of the paper. In addition, the expert committee on the specification of color monitors for the printing industry also recommends matching the monitor's white point with the color rendition of paper by visual calibration.…”

Section: Introductionmentioning

confidence: 99%

Correction of instrument measurement data for improving the visual color match between monitor and hardcopy

2009

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Abstract— Soft proofing, which can confirm the color reproduction of printed matter on a monitor, is coming into wide use in the field of graphic arts. However, there is a problem in that the color on the monitor looks different from that of printed matter, even though the L*a*b* value of the monitor's white point has been adjusted to that of the paper by using a spectroradiometer. After the color rendition of an LCD is visually adjusted to that of the paper, the measured color of the LCD shows color with L*a*b* values corresponding to a more greenish‐blue white than that of paper. For CRTs, this corresponds to a more bluish‐white. In this paper, it was assumed that bright lines in the measured spectrums of the monitors and the illuminations spread to the next wavelength band by the optical systems of the spectroradiometer. To solve the problem, a method is proposed to enhance the bright line by using a three‐tap digital filter. The effect of this method on two types of monitors under three types of illumination is also reported. After enhancing the bright lines, ΔE between the monitor and paper becomes smaller than that for the original one.

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The display profiling method with eyes and colormatching accuracy in soft proofing

Cited by 4 publications

References 2 publications

The calibration accuracy of display white point by visual calibrator under various illuminations

The calibration accuracy of display white point by visual calibrator under various illuminations

Effect of time spacing on the perceived color

Correction of instrument measurement data for improving the visual color match between monitor and hardcopy

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