[Interest] whether a color image can SAFELY be converted to a grayscale image

iMath 2281570025 at qq.com
Tue Jan 14 12:59:31 CET 2014


In the Image Formats part of QImage doc says
"
The allGray() and isGrayscale() functions tell whether a color image can safely be converted to a grayscale image.
"
what does "safely" mean here ?
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