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The SEDRIS Data Representation Model
APPENDIX C - Types SE_HSV_Data |
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/* * STRUCT: SE_HSV_Data * * This data type specifies colour data for the HSV colour model. * * If Value has a value of 0, the values of Hue and Saturation * are meaningless, because the colour will be black. If Saturation * has a value of 0, the value of Hue is meaningless, and the * value of Value will determine the shade of a grey colour, * somewhere between white and black. Hue is expected to have a * value between 0.0 and 360.0 (not including 360.0). If the value * of Hue is "undefined" (because the value of Value or Saturation * is 0), the value of Hue can be represented as * SE_POSITIVE_INFINITY, but this is not required. Basically, if * Value = 0.0, the values of Hue and Saturation should be * ignored, and if Saturation = 0.0, the value of Hue should * be ignored. The Hue Saturation Value colour model represents the * colour space as a hexagonal cone. The Hue of the colour * determines the "colour" of the colour. The Saturation of the colour * determines the "intensity" of the colour, differentiating a * "strong" red from a "weak" red, for example. And the Value of * the colour is the difference between a light colour and a dark * colour. Decreasing the Value of a colour adds black to the colour. */typedef struct
| SE_Long_Float | hue; | ||
| SE_Long_Float | saturation; | 1 | |
| SE_Long_Float | value; | 2 |
1 angle in degrees about the HSV hexcone 0 degrees = red 120 degrees = green 240 degrees = blue (expected values are between 0.0 and 360.0) ( 0.0 is included ) (360.0 will automatically be reduced to ) ( 0.0 by the functions in this API )
Saturation, which ranges from 0.0 to 1.0 (0 percent to 100 percent)
Value, sometimes called brightness, which ranges from 0.0 to 1.0
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