imread (repost)

[soren at hauberg.org]

Quoting Daniel J Sebald <daniel.sebald at ieee.org>:
> 100% transparent would be not visible, I guess.  The applications  
> would be special effects or masking off a rectangular image to make  
> it appear of a different shape.

But what does 'not visible' mean? Should we just show the background  
color of the figure? If so, I can easily imagine myself being confused  
whenever I see an all gray image -- am I looking at an all gray image  
or a transparent one?

Søren