Coordinating color produced by two devices--using a hue-controlled machine color space, or surface scaling

Claim 1

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising the steps of: interpreting first relative-position values of color parameters, within and throughout a first color element of at least two dimensions, as also being the same relative-position values of corresponding color parameters within a second color element of the same number of dimensions, with no intermediate color space other than normalized forms recited herebelow; said first color element having a portion that is not contained within the second color element, and the second color element having a portion that is not contained within the first color element; said interpreting step comprising the substeps of: finding normalized forms of said first color-parameter values, normalized with respect to the two dimensions of the first color element, and while treating the normalized forms of said first color-parameter values as also normalized relative-position values with respect to two dimensions of the second color element, reversing the normalization with respect to the second color element to determine unnormalized values within the second color element; using said unnormalized values within the second color element to derive signals for controlling the color-image presentation device; and then applying the signals to operate the color-image presentation device for presentation of the color image in said viewable form; and wherein: said first and second color elements are color surfaces; the first and second color elements have respective shapes; the interpreting and using steps comprise using simplified, geometrically more-regular approximations to the respective shapes of the first and second color elements; said surfaces are hue pages; and the approximation-using step comprises finding vertex coordinates for straight-line-bounded figures representing respective simplified shapes of the first and second color elements.

Claim 2

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising the steps of: interpreting first relative-position values of color parameters, within and throughout a first color element of at least two dimensions, as also being the same relative-position values of corresponding color parameters within a second color element of the same number of dimensions, with no intermediate color space other than normalized forms recited herebelow; said first color element having a portion that is not contained within the second color element, and the second color element having a portion that is not contained within the first color element; said interpreting step comprising the substeps of: finding normalized forms of said first color-parameter values, normalized with respect to the two dimensions of the first color element, and while treating the normalized forms of said first color-parameter values as also normalized relative-position values with respect to two dimensions of the second color element, reversing the normalization with respect to the second color element to determine unnormalized values within the second color element; using said unnormalized values within the second color element to derive signals for controlling the color-image presentation device; and then applying the signals to operate the color-image presentation device for presentation of the color image in said viewable form; and wherein: said first and second color elements are color surfaces; the first and second color elements have respective shapes; the interpreting and using steps comprise using simplified, geometrically more-regular approximations to the respective shapes of the first and second color elements; said surfaces are hue pages; and the approximation-using step comprises finding vertex coordinates for straight-line-bounded figures representing respective simplified shapes of the first and second color elements.

Claim 6

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising the steps of: interpreting relative-position values of color parameters, within and throughout a first color element of at least two dimensions, as also being the same relative-position values of corresponding color parameters within a second color element of the same number of dimensions, with no intermediate color space; said first color element having a portion that is not contained within the second color element, and the second color element having a portion that is not contained within the first color element; using said relative-position values within the second color element to derive signals for controlling the color-image presentation device; and then applying the signals to operate the color-image presentation device for presentation of the color image in said viewable form; and wherein: the first color element is expressed in terms of a perceptual color space; the second color element is expressed in terms of a device color space; and the interpreting step translates perceptual-space values within the first color element into device-space values within the second color element; the first color element is a highly simplified perceptual-space hue page of an output device; the second color element is a less-highly simplified machine-space hue page, for the same hue, of the same output device; and each of said relative-position values within the highly simplified perceptual hue page acts as a pointer into the less-highly simplified machine-space hue page of the same output device.

Claim 7

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising the steps of: interpreting relative-position values of color parameters, within and throughout a first color element of at least two dimensions, as also being the same relative-position values of corresponding color parameters within a second color element of the same number of dimensions, with no intermediate color space; said first color element having a portion that is not contained within the second color element, and the second color element having a portion that is not contained within the first color element; using said relative-position values within the second color element to derive signals for controlling the color-image presentation device; and then applying the signals to operate the color-image presentation device for presentation of the color image in said viewable form; and wherein: the first color element is expressed in terms of a perceptual color space; the second color element is expressed in terms of a device color space; and the interpreting step translates perceptual-space values within the first color element into device-space values within the second color element; the first color element is a highly simplified perceptual-space hue page of an output device; the second color element is a less-highly simplified machine-space hue page, for the same hue, of the same output device; and each of said relative-position values within the highly simplified perceptual hue page acts as a pointer into the less-highly simplified machine-space hue page of the same output device.

Claim 8

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising: interpreting relative-position values of color parameters, within and throughout a highly simplified perceptual-space hue page of an output device, as also being the same relative-position values of corresponding color parameters within a less-highly simplified machine-space hue page, of the same output device; wherein each of said relative-position values within the highly simplified perceptual hue page acts as a pointer into the less-highly simplified machine-space hue page of the same output device; and then applying pointed-to values in the less-highly simplified machine-space hue page to operate the color-image presentation device for presentation of the color image in said viewable form.

Claim 9

A method for presentation of a color image in a form viewable as a color image, using a color-image presentation device; said method comprising: interpreting relative-position values of color parameters, within and throughout a highly simplified perceptual-space hue page of an output device, as also being the same relative-position values of corresponding color parameters within a less-highly simplified machine-space hue page, of the same output device; wherein each of said relative-position values within the highly simplified perceptual hue page acts as a pointer into the less-highly simplified machine-space hue page of the same output device; and then applying pointed-to values in the less-highly simplified machine-space hue page to operate the color-image presentation device for presentation of the color image in said viewable form.

Claim 10

A method for processing information to control a color-image-presentation device that presents color images in a form viewable as color images; said method comprising: receiving or developing color-image specifications defining a desired image, at least some of said specifications being expressed in terms of a hue page; finding vertex coordinates for a straight-line-bounded figure representing a simplified shape of the hue page; characterizing the hue page in terms of the vertex coordinates; expressing the specifications with reference to the vertex coordinates; then manipulating the specifications as thus expressed with reference to the vertex coordinates; and then applying the manipulated specifications to operate the presentation device for presentation of the image in a form viewable as a color image, including control of colors as seen in the image.

Claim 11

A method for processing information to control a color-image-presentation device that presents color images in a form viewable as color images; said method comprising: receiving or developing color-image specifications defining a desired image, at least some of said specifications being expressed in terms of a hue page; finding vertex coordinates for a straight-line-bounded figure representing a simplified shape of the hue page; characterizing the hue page in terms of the vertex coordinates; expressing the specifications with reference to the vertex coordinates; then manipulating the specifications as thus expressed with reference to the vertex coordinates; and then applying the manipulated specifications to operate the presentation device for presentation of the image in a form viewable as a color image, including control of colors as seen in the image.

Claim 14

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary and a gamut gray-scale axis, including surface-scaling a color point that is outside the gamut of the device; said method comprising the steps of: defining a point within the device gamut and significantly displaced away from the gamut gray-scale axis; then constructing a line that joins an out-of-gamut color point with said defined point; then determining the intersection of the constructed line with the gamut boundary; then scaling the out-of-gamut point to said intersection to determine a surface-scaled color specification corresponding to said out-of-gamut point; and applying the surface-scaled color specification, for the out-of-gamut point, to control presentation of the corresponding color by the color-presentation device.

Claim 15

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary and a gamut gray-scale axis, including surface-scaling a color point that is outside the gamut of the device; said method comprising the steps of: defining a point within the device gamut and significantly displaced away from the gamut gray-scale axis; then constructing a line that joins an out-of-gamut color point with said defined point; then determining the intersection of the constructed line with the gamut boundary; then scaling the out-of-gamut point to said intersection to determine a surface-scaled color specification corresponding to said out-of-gamut point; and applying the surface-scaled color specification, for the out-of-gamut point, to control presentation of the corresponding color by the color-presentation device.

Claim 19

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary and a gamut gray-scale axis, including surface-scaling a color point that is outside the gamut of the device; said method comprising the steps of: defining a point within the device gamut and significantly displaced away from the gamut gray-scale axis; then constructing a line that joins an out-of-gamut color point with said defined point; then determining the intersection of the constructed line with the gamut boundary; then scaling the out-of-gamut point to said intersection to determine a surface-scaled color specification corresponding to said out-of-gamut point; and applying the surface-scaled color specification, for the out-of-gamut point, to control presentation of the corresponding color by the color-presentation device; and wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled color specification, without performing anew said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 20

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary and a gamut gray-scale axis, including surface-scaling a color point that is outside the gamut of the device; said method comprising the steps of: defining a point within the device gamut and significantly displaced away from the gamut gray-scale axis; then constructing a line that joins an out-of-gamut color point with said defined point; then determining the intersection of the constructed line with the gamut boundary; then scaling the out-of-gamut point to said intersection to determine a surface-scaled color specification corresponding to said out-of-gamut point; and applying the surface-scaled color specification, for the out-of-gamut point, to control presentation of the corresponding color by the color-presentation device; and wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled color specification, without performing anew said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 21

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and second colors respectively corresponding to first and second color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins the first out-of-gamut color point with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a second point within the same device gamut; constructing a second line that joins the second out-of-gamut color point with said second defined point; determining a second intersection of this second constructed line with the gamut boundary; scaling the second out-of-gamut point to said second intersection to determine a second surface-scaled color specification corresponding to said second out-of-gamut point; and applying the second surface-scaled color specification, for said second defined point, to control presentation of the corresponding second color by the color-presentation device.

Claim 22

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and second colors respectively corresponding to first and second color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins the first out-of-gamut color point with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a second point within the same device gamut; constructing a second line that joins the second out-of-gamut color point with said second defined point; determining a second intersection of this second constructed line with the gamut boundary; scaling the second out-of-gamut point to said second intersection to determine a second surface-scaled color specification corresponding to said second out-of-gamut point; and applying the second surface-scaled color specification, for said second defined point, to control presentation of the corresponding second color by the color-presentation device.

Claim 24

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and second colors respectively corresponding to first and second color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins the first out-of-gamut color point with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a second point within the same device gamut; constructing a second line that joins the second out-of-gamut color point with said second defined point; determining a second intersection of this second constructed line with the gamut boundary; scaling the second out-of-gamut point to said second intersection to determine a second surface-scaled color specification corresponding to said second out-of-gamut point; and applying the second surface-scaled color specification, for said second defined point, to control presentation of the corresponding second color by the color-presentation device; and wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled specification, without performing anew said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 25

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and second colors respectively corresponding to first and second color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins the first out-of-gamut color point with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a second point within the same device gamut; constructing a second line that joins the second out-of-gamut color point with said second defined point; determining a second intersection of this second constructed line with the gamut boundary; scaling the second out-of-gamut point to said second intersection to determine a second surface-scaled color specification corresponding to said second out-of-gamut point; and applying the second surface-scaled color specification, for said second defined point, to control presentation of the corresponding second color by the color-presentation device; and wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled specification, without performing anew said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 26

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and other colors respectively corresponding to plural color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins a first of said out-of-gamut color points with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a plurality of other points within the device gamut; defining plural zones, with respect to the device gamut, that correspond to the points defined within the gamut; for each particular out-of-gamut color point, determining the zone within which that particular out-of-gamut point falls; for each particular out-of-gamut color point, selecting the point, defined within the gamut, that corresponds to the zone within which that particular point falls; scaling that particular point to the intersection of the gamut boundary with a line constructed between that particular out-of-gamut point and the selected defined point; and applying each thus-surface-scaled color point to control presentation of the corresponding out-of-gamut color by the color-presentation device.

Claim 27

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and other colors respectively corresponding to plural color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins a first of said out-of-gamut color points with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a plurality of other points within the device gamut; defining plural zones, with respect to the device gamut, that correspond to the points defined within the gamut; for each particular out-of-gamut color point, determining the zone within which that particular out-of-gamut point falls; for each particular out-of-gamut color point, selecting the point, defined within the gamut, that corresponds to the zone within which that particular point falls; scaling that particular point to the intersection of the gamut boundary with a line constructed between that particular out-of-gamut point and the selected defined point; and applying each thus-surface-scaled color point to control presentation of the corresponding out-of-gamut color by the color-presentation device.

Claim 35

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and other colors respectively corresponding to plural color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins a first of said out-of-gamut color points with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a plurality of other points within the device gamut; defining plural zones, with respect to the device gamut, that correspond to the points defined within the gamut; for each particular out-of-gamut color point, determining the zone within which that particular out-of-gamut point falls; for each particular out-of-gamut color point, selecting the point, defined within the gamut, that corresponds to the zone within which that particular point falls; scaling that particular point to the intersection of the gamut boundary with a line constructed between that particular out-of-gamut point and the selected defined point; and applying each thus-surface-scaled color point to control presentation of the corresponding out-of-gamut color by the color-presentation device wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled specification, without performing anew any of said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 36

A method of presenting color images using a color-presentation device that has a gamut and a gamut boundary, including surface-scaling first and other colors respectively corresponding to plural color points that are outside the gamut of the device; said method comprising the steps of: defining a first point within the device gamut; then constructing a first line that joins a first of said out-of-gamut color points with said first defined point; then determining a first intersection of the first constructed line with the gamut boundary; then scaling the first out-of-gamut point to said first intersection to determine a first surface-scaled color specification corresponding to said first out-of-gamut point; and applying the first surface-scaled color specification, for the first out-of-gamut point, to control presentation of the first corresponding color by the color-presentation device; defining a plurality of other points within the device gamut; defining plural zones, with respect to the device gamut, that correspond to the points defined within the gamut; for each particular out-of-gamut color point, determining the zone within which that particular out-of-gamut point falls; for each particular out-of-gamut color point, selecting the point, defined within the gamut, that corresponds to the zone within which that particular point falls; scaling that particular point to the intersection of the gamut boundary with a line constructed between that particular out-of-gamut point and the selected defined point; and applying each thus-surface-scaled color point to control presentation of the corresponding out-of-gamut color by the color-presentation device wherein the defining, constructing, determining, and scaling steps are performed by: automatically finding the particular out-of-gamut color specification in a lookup table previously constructed to incorporate the defining, constructing, determining and scaling steps; and extracting from the lookup table the corresponding particular new surface-scaled specification, without performing anew any of said defining, constructing, determining and scaling steps at the time of said extracting step.

Claim 37

A method for presentation of a color image in a form viewable as a color image, using an output color-image presentation device that has a color gamut, and based upon initial color specifications developed for use in an input color-presentation device that has a different color gamut; said initial specifications being expressed in terms related to control of the input device; and said method comprising: based upon the initial specifications expressed in terms related to control of the input device, establishing for the corresponding color in perceptual terms, presented by the input device: the hue of said corresponding color, and two other coordinates of said corresponding color; under the control of said established hue, determining working coordinates of a saturated color for use in defining a simplified hue-page model at that hue; said determining being performed by reference to a tabulation of saturated-color working coordinates as a function of hue; forming ratios of said two other coordinates with said saturated-color working coordinates to find a relative position, within the simplified hue-page model at said established hue, of said corresponding color; and applying the found relative position to operate the output device for presentation of a color image in a form viewable as a color image.

Claim 38

A method for presentation of a color image in a form viewable as a color image, using an output color-image presentation device that has a color gamut, and based upon initial color specifications developed for use in an input color-presentation device that has a different color gamut; said initial specifications being expressed in terms related to control of the input device; and said method comprising: based upon the initial specifications expressed in terms related to control of the input device, establishing for the corresponding color in perceptual terms, presented by the input device: the hue of said corresponding color, and two other coordinates of said corresponding color; under the control of said established hue, determining working coordinates of a saturated color for use in defining a simplified hue-page model at that hue; said determining being performed by reference to a tabulation of saturated-color working coordinates as a function of hue; forming ratios of said two other coordinates with said saturated-color working coordinates to find a relative position, within the simplified hue-page model at said established hue, of said corresponding color; and applying the found relative position to operate the output device for presentation of a color image in a form viewable as a color image.