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

[Philipp A.]

likely that it’s grayscale to begin with, and only loaded as color pic.

so it doesn’t lose information by converting it into a format that can only
hold grayscale calues.


2014/1/14 iMath <2281570025 at qq.com>

> 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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