# CIECHROMA structure (winddi.h)

The CIECHROMA structure is used to describe the chromaticity coordinates, **x** and **y**, and the luminance, **Y** in CIE color space.

## Syntax

```
typedef struct _CIECHROMA {
LDECI4 x;
LDECI4 y;
LDECI4 Y;
} CIECHROMA;
```

## Members

`x`

Specifies the x-coordinate in CIE chromaticity space.

`y`

Specifies the y-coordinate in CIE chromaticity space.

`Y`

Specifies the luminance. For more information, see the following Remarks section.

## Remarks

The CIECHROMA structure is used by the COLORINFO structure to define colors for GDIINFO.

The LDECI4 type is used to represent real numbers to four decimal places. For example, (LDECI4) 10000 represents the real number 1.0000, and (LDECI4) -12345 represents -1.2345.

The values of the **x** and **y** members of CIECHROMA should be in the range from 0 through 10000--that is, the values should represent the numbers 0.0000 through 1.0000.

The value of the **Y** member of this structure should be in the range from 0 through 100. This member can also be 65534 (0xFFFE) under certain circumstances. For more information about these circumstances, see COLORINFO.

## Requirements

Header |
winddi.h (include Winddi.h) |