Re: 2.9.10, finally?

[John W. Eaton]

On  8-Feb-2007, Søren Hauberg wrote:

| John W. Eaton skrev:
| >   + With gnuplot 4.2, image data is plotted with gnuplot and may be
| >     combined with other 2-d plot data.
| Does this actually work?

OK, so the colors are "wrong" but it does display images with gnuplot
and allows plotting 2-d data over the images, doesn't it?

| With a recent CVS checkout I get the following 
| behaviour:
| 
|    * "imshow(rand(100))" shows a color image, while it should be a 
| gray-scale image (rand(100) is 2D and hence gray-scale).
| 
|    * "I(:,:,3) = rand(100); imshow(I)" shows a horizontal gradient image 
| where the left-most color is black, going through, purple to red, ending 
| in the right-most color being yellow. The shown image should have been a 
|   blue image containing random values.

I think the problem is that we are always applying a colormap but we
shouldn't.

The other day, I asked:

  Is there some information that shows up in the graphics handle
  properties, or is this choice made when the data is displayed?

and received no reply.  See

  
https://www.cae.wisc.edu/pipermail/octave-maintainers/2007-February/001797.html

When someone can help a little with how this should be implemented, I
can maybe do something about it.  If there is some information stored
in the graphics properties, what is it?

jwe