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color-primary transformations
Does anyone know of any formula for converting a XYZ to an RGB value?
how find rgb from XYZ in this pic?
999
The color white in any ICC RGB matrix working space profile always has the XYZ coordinates (0.9642, 1.0000, 0.8249) because that's the XYZ coordinates of the D50 standard illuminant, and the ICC decided that all ICC profiles should use D50 as the ICC profile reference white.
Hex to RGB conversionGet the 2 left digits of the hex color code and convert to decimal value to get the red color level. Get the 2 middle digits of the hex color code and convert to decimal value to get the green color level.
RGB = hsv2rgb( HSV ) converts the hue, saturation, and value (HSV) values of an HSV image to red, green, and blue values of an RGB image. rgbmap = hsv2rgb( hsvmap ) converts an HSV colormap to an RGB colormap.
Converting hex to RGB We need to take two hex values for one RGB value, convert those two hex values to decimal values, and then perform the same step with the other values. We will get 3 values that correspond to RGB values.
There is a simple linear relationship between RGB and XYZ spaces (if you wish you can express this in matrix form in the obvious way):
R = 3.2404542*X - 1.5371385*Y - 0.4985314*Z
G = -0.9692660*X + 1.8760108*Y + 0.0415560*Z
B = 0.0556434*X - 0.2040259*Y + 1.0572252*Z
However, if what you meant is sRGB space, then additional non-linear transformation needs to be applied to each component: R=adj(R), G=adj(G), and B=adj(B). The adj function is defined as follows:
function adj(C) {
if (Abs(C) < 0.0031308) {
return 12.92 * C;
}
return 1.055 * Math.pow(C, 0.41666) - 0.055;
}
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