Matlab image question

[SONYFX]

I'm trying to create a pure 256x256 blue image (RGB value (0,0,256)), but I am getting a black image, anyone know why?

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a = zeros(256, 256, 3);

a(2:145, 200:225,2) = 256;

image(uint8(a));

axis image;

 

[SONYFX]

bump

 

[Crusty]

Shouldn't it be 0,0,255 ?