NSImage masks in NSTableView

FROM : Mike Vannorsdel
DATE : Wed Jan 16 23:50:59 2002

I have an NSTableView which displays small images (NSImage) in some of the
columns.  The problem is with images that have alpha channels.  They look
fine in the table, except when the row is highlighted.  Then the images have
white edges around them.  I assume this has something to do with the way the
highlight draws over slightly transparent areas.  I know the masks are all
correct and putting the images over a background shows this.  But how do I
fix the highlight problem?  Do I need to modify the NSImage or maybe the
NSImageCell that the table uses?