Allows you access to the color as a string.
If the color is in the RGB color space then the string contains
three values representing the Red, Green and Blue levels. For example
"100 150 200".
If the color is in the CMYK color space then the string contains
four values representing the Cyan, Magenta, Yellow and Black levels.
For example "30 60 90 10".
If the color is in the Grayscale color space then the string contains
one value representing the Gray level. For example "150".
You can use the ColorSpace property to find the current color space
for the color.
Alpha values can be indicated by prepending an 'a' to an extra
component. For example "30 60 90 a120" would indicate
an RGB value with an alpha value of 120.
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