[PySide] Does isGrayscale() can tell whether a color image cansafely be converted to a grayscale image?

[iMath]

if an image only contains gray colors, is there still any need to  convert it to a grayscale image?
BTW,I think an image only contains gray colors is a grayscale image.




------------------ Original ------------------
From:  "Sean Fisk";<sean at seanfisk.com>;
Date:  Tue, Jan 14, 2014 11:09 AM
To:  "iMath"<2281570025 at qq.com>; 
Cc:  "pyside"<pyside at qt-project.org>; 
Subject:  Re: [PySide] Does isGrayscale() can tell whether a color image cansafely be converted to a grayscale image?




I would presume that if an image only contains gray colors, it can be safely converted to a grayscale image. Since allGray() and isGrayscale() indicate the former, that would also mean they indicate the latter.
 
 



--
Sean Fisk

 

On Sun, Jan 12, 2014 at 6:21 AM, 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.
 "
but in the doc of there 2 functions indicate they're used to decide whether an image is grayscale image ,not mentioned they could be used to tell whether a color image can safely be converted to a grayscale image.
 

what about your opinion ?

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