Hi:

I have some .png image use as a icon,the Original  icons  just have a single 
color symbol,like black,and the icon's background  is  transparent.

Then in our app,we need draw the icon's with different  colors under different 
conditions。

We want change the symbol's color or change the background color ,both will 
fine.

So,dose the osg::Image::Util class provide such function?

Thank you!

Cheers,
Lv

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