xyz2double - Convert XYZ color values to double

Syntax

xyxd = xyz2double(XYZ)

Description

xyxd = xyz2double(XYZ) converts an M-by-3 or M-by-N-by-3 array of XYZ color values to double. xyzd has the same size as XYZ.

The Image Processing Toolbox software follows the convention that double-precision XYZ arrays contain 1931 CIE XYZ values. XYZ arrays that are uint16 follow the convention in the ICC profile specification (ICC.1:2001-4, www.color.org) for representing XYZ values as unsigned 16-bit integers. There is no standard representation of XYZ values as unsigned 8-bit integers. The ICC encoding convention is illustrated by this table.

Value (X, Y, or Z)	uint16 Value
0.0	0
1.0	32768
1.0 + (32767/32768)	65535

Class Support

xyz is a uint16 or double array that must be real and nonsparse. xyzd is of class double.

Examples

Convert uint16-encoded XYZ values to double.

xyz2double(uint16([100 32768 65535]))
ans =

    0.0031    1.0000    2.0000

See Also

applycform | lab2double | lab2uint16 | lab2uint8 | makecform | whitepoint | xyz2uint16

How To

• Color Space Conversions

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