NAME

XcmsCIELabQueryMaxC, XcmsCIELabQueryMaxL, XcmsCIELabQueryMaxLC, XcmsCIELabQueryMinL — obtain the bounds of the target screen’s color gamut in terms of CIE L∗a∗b∗ coordinates. 

SYNOPSIS

Status XcmsCIELabQueryMaxC(ccc, hue_angle, L_star, color_return)
      XcmsCCC ccc;
      XcmsFloat hue_angle;
      XcmsFloat L_star;
      XcmsColor ∗color_return; Status XcmsCIELabQueryMaxL(ccc, hue_angle, chroma, color_return)
      XcmsCCC ccc;
      XcmsFloat hue_angle;
      XcmsFloat chroma;
      XcmsColor ∗color_return; Status XcmsCIELabQueryMaxLC(ccc, hue_angle, color_return)
      XcmsCCC ccc;
      XcmsFloat hue_angle;
      XcmsColor ∗color_return; Status XcmsCIELabQueryMinL(ccc, hue_angle, chroma, color_return)
      XcmsCCC ccc;
      XcmsFloat hue_angle;
      XcmsFloat chroma;
      XcmsColor ∗color_return;

ARGUMENTS

cccSpecifies the color conversion context.  Note that the CCC’s Client White Point and White Point Adjustment procedures are ignored. 

chromaSpecifies the CIELAB psychometric chroma at which to find maximum lightness (MaxL) or minimum lightness (MinL).  or minimum lightness (MinL) or hue angle (MaxLC)

color_return
Returns the CIE L∗a∗b∗ coordinates of maximum chroma (MaxC and MaxLC), maximum lightness (MaxL), displayable by the screen for the given C hue angle and lightness (MaxC), hue angle and chroma (MaxL and MinL), C. The white point associated with the returned color specification is the Screen White Point. The value returned in the pixel member is undefined. or minimum lightness (MinL)

hue_angleSpecifies the CIELAB psychometric hue angle in degrees at which to find maximum chroma (MaxC and MaxLC), maximum lightness (MaxL), . 

L_starSpecifies the lightness (L∗) at which to find maximum chroma (MaxC). 

RETURNS

Zero on failure, non-zero on success. 

AVAILABILITY

Release 5 and later. 

DESCRIPTION

XcmsCIELabQueryMaxC() finds the point of maximum chroma displayable by the screen at the given hue angle and lightness. 

XcmsCIELabQueryMaxL() finds the point in CIELAB color space of maximum lightness (L∗) displayable by the screen at the given hue angle and chroma.  An XcmsFailure return value usually indicates that the given chroma is beyond maximum for the given hue angle. 

XcmsCIELabQueryMaxLC() finds the point of maximum chroma displayable by the screen at the given hue angle. 

XcmsCIELabQueryMinL() finds the point of minimum lightness (L∗) displayable by the screen at the given hue angle and chroma.  An XcmsFailure return value usually indicates that the given chroma is beyond maximum for the given hue angle. 

All these functions return a point in CIE L∗a∗b∗ color space coordinates. 

SEE ALSO

XcmsCIELuvQueryMaxC(), XcmsCIELuvQueryMaxL(), XcmsCIELuvQueryMaxLC(), XcmsCIELuvQueryMinL(), XcmsTekHVCQueryMaxC(), XcmsTekHVCQueryMaxL, XcmsTekHVCQueryMaxLC, XcmsTekHVCQueryMinL, XcmsQueryBlack(), XcmsQueryBlue(), XcmsQueryGreen(), XcmsQueryRed(), XcmsQueryWhite(). 

Xlib Reference Manual