White images with 'imshow'

[John W. Eaton]

On 22-May-2009, Søren Hauberg wrote:

| Hi All
| 
| The 'imshow' function has 8 demos. The first 4 should produce pictures
| of a cute baby, but I get 3 white images and one that's yellow. I'm
| guessing this is related to the handling of colour maps, but I haven't
| had the time to investigate properly.

I checked in the following change:

  http://hg.savannah.gnu.org/hgweb/octave/rev/7f3a1a90f4f4

It would be nice if this change was also included in 3.2.0 since it
will make the demo work correctly.  But it probably won't affect many
users since I doubt very many people are using the old Octave image
format for any real work.

jwe