Re: imread (repost)

[soren]

Quoting Daniel J Sebald <address@hidden>:

> address@hidden wrote:
> > Quoting Daniel J Sebald <address@hidden>:
> >
> > > 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?
>
> Yes, whatever is behind the image (up to the point of plotting the  
> image) gets blended with the image.  Wherever the image is 100%  
> transparent the contents behind it is completely visible, i.e.,  
> unaltered.

Currently (and also in matlab I believe) you can only view one image  
at a time. So my question is basically, what is behind image? Say I  
run the following

  im = rand (100, 100, 4);
  im (:, :, 4) = 1; # full transparancy
  figure
  imshow (im)

What should I expect to see?

Søren