Something similar to what you're asking was discussed on this list
last week. To get you started:
[window setOpaque:NO];
[window setBackgroundColor:[NSColor colorWithCalibratedWhite:1.0
alpha:0.5]];
On Feb 9, 2009, at 1:55 PM, Christian Graus wrote:
I have a window with an image showing on it. Above this I have a
window,
which contains an IKImageView derived class. The IKImageView has a
PNG in
it, which has a transparency layer. What I need to do, is to make
that
image appear above the image I have in my main window, that is, the
control
needs to be transparent, so that one picture appears above
another. I've
found a sample that sets the window alpha, but that fades the whole
window,
I just want to make the background transparent. I'd appreciate any
suggestions.
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