On Sun, Feb 13, 2005 at 12:24:21PM -0800, William Skaggs wrote:
> Cristian David wrote:
> > I downloaded the Picture "Eastern Hemisphere 2048 by 2048 pixels
> > (7.1 MB TIFF)" from
> > http://earthobservatory.nasa.gov/Newsroom/BlueMarble/ .
> >
> > After this I tried to put another layer over the black part. But
> > what ever I tried, the black part of the picture covers it. Another
> > strange thing is, that die black part is allways shown, even when
> > al* layers are deactivated.
> Carol Spears wrote:
> > the error message from gimp is somewhat revealing, however:
> > alpha channel type not defined for file
> > ~/.gimp-2.3/tmp/gimp_temp_157230.tif. Assuming alpha is not
> > premultiplied 
> An even more revealing error message appears if you try to display
> this image using xv:  "Sorry, can not handle 6 channel images."

And gimp loads those extra channels fine.
> It looks like the GIMP tiff plug-in mishandles the image in a 
> way that causes data corruption in the core.

No data corruption, the black parts are the extra channel data. What the
data means isn't clear, since NASA didn't tell us what the data

They can safely be deleted from the channels view if one doesn't need

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