Float is only supported in Maya 15 and above. And when saving the image from 
the render view as exr its definitely float. 
What I am trying to do is getting float pixel values when hovering with the 
cursor above the image.

What I have done so far is grabbing the whole screen image and saving it as a 
qimage. Then getting the global mouse x and y to query the pixel rgb value 
under the cursor. Its works pretty smooth..
Now I want to extend the feature, and use it with maya's updated render view( 
float values)..but grabbing just grabs 8 bit..

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