[Vv] Functionality of the fusion opacity slider

[Shirhatti, Shruti (GE Global Research, non-GE)]

Dear All,
 
As per my understanding, the opacity slider functions as following
When a fusion image is added and the slider is at the left extreme,
opacity is 0, ie the base image is completely visible, right extreme
implies the fusion image is completely visible and in between is a
combination.
eg: halfway through the slider means both base and fusion images are
equally visible
Is my understanding correct?
Im still a little confused as to what the opacity slider is doing?
I tried several datasets but it varies from image to image
An image that is clearly visible at a certain window and level when
loaded independently is not visible at all when I load it as a fusion on
another image inspite of setting the window and level correctly and
moving the opacity slider to the right extreme.
 
 
Thanks and Regards,
Shruti
 
 
 
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