Colormap not working: is it too long?

When I use the following colormap, cmap1, I only get two colors displayed in my figure. Why does Matlab hate my colormap?

 cjet   = [jet];
 njet   = numel(cjet(:,1));
 c0     = 0.2;
 cm     = 0.3;
 c1     = 1.0;
 wn     = round(njet*(c1-c0)/(cm-c0)-njet)+1;
 stp    = 1/(wn-1);
 jet2white = [(1-(stp:stp:1)')*0.5 zeros(wn-1,1) zeros(wn-1,1)];
 cmap1  = [cjet; jet2white];

 figure; imagesc(rand(100,100)); colormap(cmap1); caxis([0 1]);

Answer 1

[Image Analyst]

I get more than 2 colors, but anyway, your cmap1 is 512 rows long. It should be 256 rows long. I believe it just ignores the second 256 rows.

[Walter Roberson]

256 rows is an MS Windows limitation. OS-X and Linux are happy to use more rows; I just happily used 65535 entries on OS-X.

[Mike Garrity]

The Windows 256 color limitation was removed in R2014b.

[Image Analyst]

Christopher, what operating system and version of MATLAB are you using?