Oh dear. Wikipedia strikes again. :-(
Those percentages are for very specific purposes and are NOT what is
generally used in conversion to greyscale. The article isn't really
*wrong*, but it doesn't bear much resemblance to most real-life usage.
Ian
On 29 Nov 2007, at 10:56, Luis wrote:
From Wikipedia: http://en.wikipedia.org/wiki/Greyscale
'Converting color to grayscale
To convert any color to its most approximate level of gray, first
one must obtain the values of its red, green and blue (RGB) primaries.
Then, add 30% of the red value, 59% of the green value, and 11% of
the blue value, together. Regardless of the scale employed (0.0 to
1.0, 0 to 255, 0% to 100%, etc.), the resultant number is the
desired gray value, such that a new RGB color would have red,
green, and blue values equal to the new number. These percentages
are chosen due to the different relative sensitivity of the normal
human eye to each of the primary colors (less sensitive to green,
more to blue).'
Cheers,
Luis.
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