CN110399633B - Display color management implementation method capable of correcting glare influence - Google Patents
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Abstract
The invention discloses a display color management implementation method capable of correcting glare influence, which comprises the steps of calculating a tristimulus value of glare generated on the surface of a display by detecting spectral radiation power distribution of ambient light and spectral reflectivity of the display in a backlight off state, detecting tristimulus values of self-luminous colors of the display under multiple groups of standard RGB control values, converting each tristimulus value of self-luminous color into L after adding the tristimulus value of the glare to each tristimulus value of self-luminous color, and converting the L into L * a * b * Value, using a series of RGB values and corresponding L * a * b * Values are made to the display profile and set to the default display device profile. The invention can realize color management of the display equipment under the bright room condition, and can ensure that the display colors and the digital files seen by human eyes under the bright room condition are in L * a * b * The chromatic values in the color space are consistent, and the requirements of color sampling, pigment color matching, artistic design and the like by using a display under the bright room condition in the color copying industry are met.
Description
Technical Field
The invention relates to the field of color reproduction, in particular to a display color management implementation method capable of correcting glare influence.
Background
Industries related to color reproduction, such as publishing, printing, textile printing, furniture veneering printing, ceramic printing and the like, need to utilize a display to simulate and display the color of a hard copy, and the simulated and displayed color is required to be as close as possible to the color of the hard copy so as to meet the requirements of utilizing the display to realize color proofing, pigment matching, artistic design and the like.
The existing solution for color management of international color consortium (international color consortium ICC) is to first establish a color control value RGB and a presented chromatic value L of a display * a * b * The corresponding relation between the values is called the property file of the display, and the digital image file to be opened or newly created is then displayed by using the software with the color management function, such as Adobe Photoshop, etcConversion of the previous color space to L according to the digital file embedded or specified profile * a * b * And calling the characteristic file of the display to convert the characteristic file into a color control value RGB of the display so as to realize color display, and enabling the display color to reproduce the original colors recorded by the digital file.
However, in the existing color management method, when a display characteristic file is manufactured, a color measuring instrument is adsorbed on the surface of a screen to measure the display color of the screen, so that the influence of ambient light is avoided, and the mapping relation between the display color control value RGB and the display chromatic value is established. The colors displayed after conversion according to this mapping relation theoretically need to be observed in a nearly dark space, so that the correct colors can be observed. However, in practical applications, whether in offices, design rooms, or production workshops, the display image is generally viewed in a bright room, and ambient light inevitably irradiates the display, and after reflection, the ambient light enters the human eyes together with the display self-luminescence, which affects the human observation effect on the display image, especially on a dark tone part, and the effect of the ambient light on the display color is called glare effect, which increases the brightness, decreases the saturation, and decreases the contrast of the display color seen by the human.
Therefore, when a display is observed in a bright room environment, it is necessary to correct the influence of glare on the observation of display colors by human eyes on the basis of the existing ICC color management technology. Xuyangyang Liu Xiaoning in the study of influence of ambient light on display color, a text proposes that a color measuring instrument is placed at a position about 25cm away from a screen to measure the color of the screen, a light signal received by the instrument contains the dazzling effect of ambient light, and then a display characteristic file is established according to measurement data to realize color management under the bright room condition. However, the remote measurement of the screen color requires the use of a spectroradiometer, the color accuracy is high but the instrument is expensive, the measurement speed is slow, the measurement value is affected by the relative position between the instrument and the screen, and the repeatability is poor, so that the method and the device are not suitable for the color management of the display in production.
Disclosure of Invention
The invention provides a display color management implementation method capable of correcting glare influence, which solves the problem that the color observed by human eyes is distorted due to the influence of ambient light reflected on the surface of a screen because the existing ICC color management method is not suitable for display color control under the bright room condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for implementing display color management capable of correcting glare effects, comprising the steps of:
s1, detecting and calculating a tristimulus value of glare generated by ambient light on the surface of a display;
s2, detecting and calculating tristimulus values of self-luminous colors of the display under multiple groups of standard RGB control values;
s3, adding each self-luminous tristimulus value and the glare tristimulus value and converting the sum into L * a * b * A value;
s4, utilizing a series of RGB values and corresponding L * a * b * The values are made into a display profile and set as the default display device profile for the system.
Further, the method for detecting the tristimulus value of the glare generated on the display surface by the computing environment light is as follows: closing the backlight of a display screen, measuring the spectral reflectivity of the screen by using a spectrophotometer, recording as rho (lambda), measuring the spectral radiant power distribution of ambient light on the surface of the screen, recording as S (lambda), and calculating the tristimulus value of the glare reflected by the screen, wherein the formula is as follows:
wherein X 0 、Y 0 、Z 0 For the tristimulus value of the glare,
the tristimulus value of the spectrum of a CIE1931 standard chromaticity observer is shown, and pi is the circumferential rate;
further, a detection and calculation displayThe method of self-luminous tristimulus values under various RGB control values is as follows: turning on the screen backlight of the display, preheating for 30 minutes, and allowing the display to alternately display n groups of RGB values, which are recorded as R i G i B i I is a number from 1 to n, and each group R is measured by adsorbing on the surface of a screen with a spectrophotometer i G i B i Controlling the color of the self-luminous display of the screen under the control value to obtain spectral radiation power distribution E (lambda) i Then calculates the tristimulus value X i Y i Z i The formula is as follows:
further, the sum of the tristimulus values of the self-luminous colors and the glare is converted into L * a * b * The method of the value is: the tristimulus value X of the self-luminous display color of the screen under each set of RGB value control values i Y i Z i Tristimulus value X of glare with screen 0 Y 0 Z 0 Add, the formula:
wherein X i ′、Y i ′、Z i ' is the tristimulus value of the screen after self-luminescence and glare under the ith group of RGB control values. Reuse of X i ′Y i ′Z i ' value by D 50 Calculating L for reference white for standard illuminant * a * b * Value, is recorded as
Further, when the spectral radiant power distribution of the ambient light is measured on the screen surface, the screen backlight must be in a closed state, the screen must be placed in the environment where it is normally used, and the measuring head measures the ambient light perpendicularly and in a direction away from the screen once, which is denoted as S (lambda) 1 The measuring head makes 4 measurements in the direction of 45 degrees away from the screen,each time at 90 ° intervals on a plane parallel to the screen, denoted as S (λ) 2 、S(λ) 3 、S(λ) 4 、S(λ) 5 Calculating an average value by using the 5 measured values, and recording the average value as the spectral radiation power distribution S of the ambient light on the surface of the screen (λ) The calculation formula is as follows:
the invention has the beneficial effects that:
the invention can realize color management of the display equipment under the bright room condition, and can ensure that the display colors and the digital files seen by human eyes under the bright room condition are in L * a * b * The chromaticity values in the color space coincide. In the color reproduction related industry, software with color management function is utilized to convert digital image files in RGB or CMYK mode into L according to ICC color management method * a * b * The color space is converted into the color control value RGB of the display according to the method of the invention, so that the display color can accurately reproduce the original color recorded by the digital file, and the requirements of color proofing, coloring material matching, artistic design and the like by utilizing the display are met. Meanwhile, the method utilizes the same color detection instrument to measure and then calculate the tristimulus values of the self-luminous light of the display and the reflected glare of the display, and has low requirement on equipment and high detection efficiency.
Drawings
FIG. 1 is a flow diagram of a display color management implementation capable of correcting glare effects according to an embodiment of the present invention;
FIG. 2 is a position of placement of a colorimeter according to an embodiment of the invention on a surface perpendicular to a display screen;
fig. 3 is a position where the colorimetric instrument of the embodiment of the present invention is placed on a plane parallel to the screen of the display.
Detailed Description
Research shows that the reflected light on the surface of the display does not change with whether the backlight of the display is turned on or not and the self-luminous color of the display changes, so that the tristimulus value of the display color observed by human eyes under the bright room condition is equal to the sum of the tristimulus value of the display color under the dark room environment and the tristimulus value of the reflected light under the turning-off state of the backlight of the display. The present invention realizes color management of display colors according to this principle, and the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
A spectrophotometer with the functions of simultaneously detecting the radiation power distribution of a light source, the self-luminous radiation power distribution of a display and the spectral reflectivity of a reflecting object is adopted as measuring equipment of the method, such as I1Pro of Achrome company, and when the same instrument is used for measuring different objects, the same sampling interval and spectral sensitivity are realized, so that the method is favorable for precision and calculation efficiency.
As shown in fig. 1, a method for implementing color management of a display capable of correcting glare effects includes the following steps:
closing the backlight of the screen of the display, adjusting the spectrophotometer to a reflection measurement mode capable of detecting the spectral reflectivity of a reflection object, gently placing the spectrophotometer on the surface of the screen, and measuring the spectral reflectivity of the screen and recording the spectral reflectivity as rho (lambda);
keeping the backlight of the display screen in a closed state, placing the screen in an environment where the screen is normally used, adjusting the spectrophotometer to an ambient light measurement mode capable of detecting the radiation power distribution of the light source, and placing the spectrophotometer close to the surface of the screen, wherein the measurement head is vertical to and departs from the screen direction for measuring once and is marked as S (lambda) 1 The measuring head measures 4 times at an angle of 45 ° away from the screen, each time at 90 ° intervals on a plane parallel to the screen, as shown in fig. 2 and 3 and noted S (λ) 2 、S(λ) 3 、S(λ) 4 、S(λ) 5 The 5 measurements were calculated according to equation (1), and the spectral radiant power distribution S (λ) of the ambient light on the screen surface was expressed as:
calculating the tristimulus value of the glare reflected by the display screen by utilizing the spectral radiation power distribution of the position where the display is positioned and the spectral reflectivity of the display screen, wherein the formula is as follows:
wherein X 0 、Y 0 、Z 0 For the tristimulus value of the glare,
the color spectrum tristimulus value is the CIE1931 standard chromaticity observer spectrum tristimulus value, and pi is the circumference ratio;
after the backlight of the display screen is turned on and the display screen is preheated for 30 minutes, the display displays n groups of standard RGB control values in turn by using the existing software, such as MeasureTool of Eiseli company, or programming programs, and the control values are recorded as R i G i B i I is a number from 1 to n, the spectrophotometer is attached to the screen surface, the spectrophotometer is adjusted to a radiation measuring mode capable of detecting the radiation power distribution of the screen, and each group R is measured i G i B i Corresponding to the displayed color, obtaining the spectral radiation power distribution E (lambda) of self-luminescence of the screen i Then, calculating the tristimulus value X of the self-luminous color block of the screen according to the formula (3) i Y i Z i ：
Adding the tristimulus value of each self-luminous color block to the tristimulus value of the glare in the backlight off state to obtain a tristimulus value equivalent to the feeling of human eyes in a bright room environment, wherein the calculation method is shown as formula (4):
wherein X i ′、Y i ′、Z i ' is the tristimulus value of the display color plus screen glare for the ith set of RGB values. Reuse of X i ′Y i ′Z i ' value by D 50 Calculating L for reference white for standard illuminant * a * b * Value, is recorded as
The calculation method is shown in formulas (5) and (6):
wherein X D50 、Y D50 、Z D50 Is D 50 The tristimulus values of the standard illuminant are respectively as follows: 96.42, 100.00, 82.49, function f is:
using n sets of RGB values R i G i B i (i is a number from 1 to n) and corresponding n groups L * a * b * Value of
The display characteristic file is manufactured by using the existing color management tool software, such as Profilemaker of Achrome corporation, or self-programming software, and the generated display characteristic file is set as the default display device characteristic file in a computer operating system. Opening the image file in RGB mode or CMYK mode by using image processing software with color management function, such as Photoshop of Adobe corporation, calling the characteristic file embedded in the image file by the software, or converting the color space from RGB or CMYK to L by using the specified characteristic file * a * b * Calling a characteristic file of default display equipment of the system in the color space, converting the characteristic file into an RGB control value, and controlling color display; if the software opens L * a * b * Directly calling the default characteristic file of the display equipment of the system to convert the color value from L to the image file of the mode * a * b * Color control values for converting color space into RGB space for controlling colorAnd (6) displaying. Due to L in the property file of the current default display device * a * b * The chromatic value of the color space contains the influence of dazzling light, the color displayed by the current RGB control value has the visual effect equal to that of the digital image file in L under the condition of environmental light * a * b * The chromaticity value of the color space, so that correct color reproduction under bright room conditions can be achieved.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (8)
1. A display color management implementation method capable of correcting glare effects, comprising the steps of:
s1, detecting and calculating a tristimulus value of glare generated by ambient light on the surface of a display;
s2, detecting and calculating tristimulus values of self-luminous colors of the display under multiple groups of standard RGB control values;
s3, adding the tristimulus values of the self-luminous colors and the glare and converting the sum into L * a * b * A value;
s4, using a series of RGB values and corresponding L * a * b * The values are made into a display profile and set as the default display device profile for the system.
2. The method for implementing color management of a display capable of correcting glare effects according to claim 1, wherein step S1 specifically comprises:
s11, closing the backlight of the display screen, and measuring the spectral reflectivity of the display screen and recording as rho (lambda);
s12, measuring spectral radiation power distribution of ambient light on the surface of the display screen, recording as S (lambda), and calculating a tristimulus value of glare reflected by the display screen, wherein the formula is as follows:
wherein X 0 、Y 0 、Z 0 For the tri-stimulus value of the glare,
is the tristimulus value of the spectrum of a CIE1931 standard chromaticity observer, and pi is the circumferential ratio.
3. The method according to claim 1, wherein the step S2 is specifically as follows:
s21, turning on the backlight of the screen of the display, preheating for 30 minutes, and displaying n groups of RGB values in turn by the display and recording as R i G i B i I is a number from 1 to n,
s22, measuring each group R i G i B i Controlling the color self-luminous displayed on the display screen under the control value to obtain spectral radiation power distribution E (lambda) i Calculating the tristimulus value X i Y i Z i The formula is as follows:
4. the method for implementing color management of a display capable of correcting glare effects according to claim 1, wherein the step S3 is specifically:
the tristimulus value X of the self-luminous display color of the screen under each set of RGB value control values i Y i Z i Tristimulus value X of glare with screen 0 Y 0 Z 0 Adding, the formula is:
wherein X i ′、Y i ′、Z i ' is the tristimulus value of the screen after self-luminescence and glare under the ith group of RGB control values; by using X i ′Y i ′Z i ' value by D 50 The standard illuminant calculated the values of la and b for the reference white, noted
5. The method of claim 2, wherein the display comprises a color management module for correcting glare effects,
in step S12, when the spectral radiant power distribution of the ambient light is measured on the surface of the display screen, the screen backlight should be in a closed state, the screen should be placed in the environment where it is normally used,
the measuring head measures the measurement time perpendicularly to and away from the screen, marked S (lambda) 1 The measuring head measures 4 times at an angle of 45 DEG away from the screen, each time at 90 DEG intervals on a plane parallel to the screen, and is denoted by S (lambda) 2 、S(λ) 3 、S(λ) 4 、S(λ) 5 Calculating an average value by using the 5 measurement values, and recording the average value as the spectral radiation power distribution S of the ambient light on the surface of the screen (λ) The calculation formula is as follows:
6. a method for implementing color management of a display capable of correcting glare effects according to claim 2, wherein: in step S11, the spectral reflectance of the display screen is measured using the reflectance measurement mode of the spectrophotometer.
7. A method for implementing color management of a display capable of correcting glare effects according to claim 2, wherein: in step S12, the spectral radiation power distribution of the ambient light is measured using the ambient light measurement mode of the spectrophotometer.
8. A method for implementing color management for a display capable of correcting glare effects according to claim 3, wherein: in step S22, a spectrophotometer is attached to the surface of the screen, and each group R is measured using a radiometric mode i G i B i Controlling the color of the self-luminous display of the screen under the control value to obtain spectral radiation power distribution E (lambda) i 。
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