# US 8,570,517 B2 · Colorimetric value calculating method, profile generating method, color conversion method, color conversion apparatus, and computer-readable recording medium with color conversion program recorded therein > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,517 B2 - Document ID: US8570517B2 - Status: Granted - Kind: B2 - Application number: 12/880,826 - Filed: 2010-09-13 - Published: 2011-03-17 - Granted: 2013-10-29 - Earliest claimed: 2009-09-14 - Assignees: FUJIFILM Corporation - Applicants: Shuhei Horita - Inventors: Shuhei Horita - Web page: https://patentgrep.com/patent/US8570517B2 ## CPC - G01J 3/52: using colour charts - G01J 3/46: Measurement of colour; Colour measuring devices, e.g. colorimeters (measuring colour temperature G01J5/60) - G01J 3/462: {Computing operations in or between colour spaces; Colour management systems} - H04N 1/6033: {using test pattern analysis (H04N1/6055 takes precedence)} - H04N 1/6088: {by viewing conditions, i.e. conditions at picture output} - H04N 1/6097: {depending on the characteristics of the output medium, e.g. glossy paper, matt paper, transparency or fabrics} - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract First spectral data (spectral transmittance) of a printed object, and second spectral data (spectral reflectance) of the printed object are obtained. Further, third spectral data (spectral radiance distribution) of a transmissive light source, and fourth spectral data (spectral radiance distribution) of a reflective light source are obtained. Then, using the first, second, third and fourth spectral data, colorimetric value data of the printed object in a given observational environment is calculated. ## Claims ### Claim 1 A colorimetric value calculating method for calculating a colorimetric value of a printed object including an image formed on a light-transmissive medium in an observational environment in which both a transmissive light source and a reflective light source coexist, comprising: a first acquisition step for acquiring a spectral transmittance of the printed object and a spectral reflectance of the printed object; a second acquisition step for acquiring a spectral distribution of the transmissive light source and a spectral distribution of the reflective light source; and a calculating step for calculating the colorimetric value of the printed object in the observational environment, using the obtained spectral transmittance of the printed object, the obtained spectral reflectance of the printed object, the obtained spectral distribution of the transmissive light source, and the obtained spectral distribution of the reflective light source. ### Claim 2 (depends on 1) A colorimetric value calculating method according to claim 1, further comprising a third acquisition step for acquiring a degree of influence of the transmissive light source and the reflective light source with respect to how the printed object is viewed, wherein the calculating step calculates the colorimetric value of the printed object in the observational environment further using the degree of influence. ### Claim 3 (depends on 1) A colorimetric value calculating method according to claim 1, further comprising: an estimating step of estimating an optical material characteristic value of a protective film; a third acquiring step of acquiring a spectral transmittance of the protective film; a first predicting step of predicting a spectral transmittance of a protective-film-covered print, which is made up of the printed object covered by the protective film, using the spectral transmittance of the printed object and the obtained spectral transmittance of the protective film; and a second predicting step of predicting a spectral reflectance of the protective-film-covered print, using a spectral reflectance of the printed object and the estimated optical material characteristic value of the protective film, wherein the calculating step calculates a colorimetric value of the protective-film-covered print in the observational environment. ### Claim 4 (depends on 1) A colorimetric value calculating method according to claim 1, wherein the second acquisition step is performed using a measuring unit for measuring the light sources or an acquiring unit for acquiring data from a database. ### Claim 5 (depends on 2) A colorimetric value calculating method according to claim 2, wherein the third acquisition step is performed using an acquiring unit for acquiring the degree of influence based on a predetermined setting, or using an acquiring unit for acquiring the degree of influence by measuring the transmissive light source and the reflective light source. ### Claim 6 (depends on 2) A colorimetric value calculating method according to claim 2, further comprising: an estimating step of estimating an optical material characteristic value of a protective film; a fourth acquiring step of acquiring a spectral transmittance of the protective film; a first predicting step of predicting a spectral transmittance of a protective-film-covered print, which is made up of the printed object covered by the protective film, using the spectral transmittance of the printed object and the obtained spectral transmittance of the protective film; and a second predicting step of predicting a spectral reflectance of the protective-film-covered print, using a spectral reflectance of the printed object and the estimated optical material characteristic value of the protective film, wherein the calculating step calculates a colorimetric value of the protective-film-covered print in the observational environment. ### Claim 7 (depends on 1) A colorimetric value calculating method according to claim 1, said calculating of the colorimetric value further taking into account environmental observational aspects of the printed object including at least one of a light source of observational environment of the printed object and a manner of display of the printed object. ### Claim 8 (depends on 1) A colorimetric value calculating method according to claim 1, wherein the spectral reflectance and spectral transmittance are determined from a same side of the printed object.