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

[Constantin Makshin]

It means "without losing any [color] information".
On Jan 14, 2014 3:59 PM, "iMath" <2281570025 at qq.com> wrote:

> 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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