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xyz2rgbwide

Convert CIE 1931 XYZ color values to wide-gamut RGB color values

    Description

    example

    RGB = xyz2rgbwide(XYZ,BPS) converts the specified CIE 1931 XYZ color values to wide-gamut RGB values in the BT.2020 or BT.2100 color space. BPS specifies the number of bits required to represent each channel of the output RGB values.

    RGB = xyz2rgbwide(XYZ,BPS,Name,Value) specifies options using one or more name-value pair arguments.

    Examples

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    Convert XYZ color values into 10-bit or 12-bit, wide-gamut RGB values in the BT.2020/BT.2100 color space.

    Convert XYZ Color into 10-bit, BT.2020 RGB Value

    Create an XYZ value.

    xyzvalue = [0.25 0.40 0.10];

    Convert the XYZ value to a 10-bit, BT.2020 RGB value.

    rgbvalue = xyz2rgbwide(xyzvalue,10)
    rgbvalue = 1x3 uint16 row vector
    
       504   670   289
    
    

    Convert XYZ Color into 12-bit, BT.2100 RGB Value

    Create an XYZ value.

    xyzvalue = [0.25 0.40 0.10];

    Convert the XYZ value to a 12-bit, BT.2100 RGB value.

    rgbvalue = xyz2rgbwide(xyzvalue,12,'Colorspace','BT.2100')
    rgbvalue = 1x3 uint16 row vector
    
       2015   2681   1155
    
    

    Convert XYZ Color into 10-bit, BT.2100 RGB Value Using HLG

    Create an XYZ value.

    xyzvalue = [0.25 0.40 0.10];

    Convert the XYZ value to a 10-bit, BT.2100 RGB value, the the Hypbrid Log Gamma (HLG) transfer function.

    rgbvalue = xyz2rgbwide(xyzvalue,12,'Colorspace','BT.2100','LinearizationFcn','HLG')
    rgbvalue = 1x3 uint16 row vector
    
       2875   3285   1989
    
    

    Input Arguments

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    Color values in the CIE 1931 XYZ color space, specified as one of the following:

    • p-by-3 numeric matrix of color values (one color per row)

    • m-by-n-by-3 numeric array representing an image

    • m-by-n-by-3-by-f numeric array representing a stack of images

    Data Types: single | double

    Bits per sample for each channel of the output RGB image, specified as the numeric scalar 10 or 12.

    Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

    Name-Value Pair Arguments

    Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

    Example: rgb = xyz2rgbwide([0.25 0.40 0.10],12,'ColorSpace','BT.2100')

    Color space of the output RGB values, specified as the comma-separated pair consisting of 'ColorSpace' and the value 'BT.2020' or 'BT.2100'.

    Data Types: char | string

    Reference white point, specified as the comma-separated pair consisting of 'WhitePoint' and a 1-by-3 vector or any of the values in the following table.

    ValueWhite Point
    'a'

    CIE standard illuminant A, [1.0985, 1.0000, 0.3558]. Simulates typical, domestic, tungsten-filament lighting with correlated color temperature of 2856 K. 

    'c'CIE standard illuminant C, [0.9807, 1.0000, 1.1822]. Simulates average or north sky daylight with correlated color temperature of 6774 K. Deprecated by CIE.
    'e'Equal-energy radiator, [1.000, 1.000, 1.000]. Useful as a theoretical reference.
    'd50'CIE standard illuminant D50, [0.9642, 1.0000, 0.8251]. Simulates warm daylight at sunrise or sunset with correlated color temperature of 5003 K. Also known as horizon light.

    'd55'

    CIE standard illuminant D55, [0.9568, 1.0000, 0.9214]. Simulates mid-morning or mid-afternoon daylight with correlated color temperature of 5500 K.  

    'd65'CIE standard illuminant D65, [0.9504, 1.0000, 1.0888]. Simulates noon daylight with correlated color temperature of 6504 K. 
    'icc'Profile Connection Space (PCS) illuminant used in ICC profiles. Approximation of [0.9642, 1.000, 0.8249] using fixed-point, signed, 32-bit numbers with 16 fractional bits. Actual value: [31595,32768, 27030]/32768.

    Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | char | string

    Transfer function for transformation, specified as the text string 'LinearizationFcn' and either of the following values:

    ValueDescription
    'PQ'Perceptual Quantization
    'HLG'Hybrid Log Gamma

    Data Types: char | string

    Output Arguments

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    Output RGB color values, returned as a numeric array of the same dimensions as the XYZ input value, of class uint16. The following table shows the data range for the wide-gamut color values for 10- and 12-bit data. The minimum value in each range maps to black, and the maximum value in each range maps to white.

    Data TypeFull Data RangeData Range for Wide-Gamut RGB
    10-bit[0, 1023][64, 940]
    12-bit [0, 4095][256, 3760]

    References

    [1] Rec. ITU-R BT.2020-2 (10/2015), Parameter values for ultra-high definition television systems for production and international programme exchange.International Telecommunication Union; Broadcasting service (television). https://www.itu.int

    [2] Rec. ITU-R BT.2100-2 (07/2018), Image parameter values for dynamic range television for use in production and international programme exchange.International Telecommunication Union; Broadcasting service (television).https://www.itu.int

    [3] Rec. ITU-R BT.2390-7 (07/2019), High dynamic range television for production and international programme exchange.International Telecommunication Union; Broadcasting service (television). https://www.itu.int

    Introduced in R2020b