Imagesc change "background" color

Hello guys,

I have a simple question, how can I set "background" color to white? Or how can I set a color of points with a specific value - for example all ones will be white.

Best regards

a = rand(50);
b = zeros(10,50);
c = [b; a; b];
imagesc(c)
colormap jet

Answer 1

[Image Analyst]

Use a different colormap

cmap = jet(256);
% Make lowest one black
cmap(1,:) = 0;
colormap(cmap);

Answer 2

[DGM]

If you're using MIMT, this becomes simple. Just construct the image in whole and display it. Don't try to deal with conditionally colormapping different parts of an image.

% inputs
A = rand(50); % a 2D array on any arbitrary scale
padw = [10 0]; % [y x]
padcolor = [0.7 0 1]; % any I/IA/RGB/RGBA color tuple
CT = parula(256); % a colormap

% create pseudocolor image in RGB
outpict = gray2pcolor(A,CT,'cdscale'); % same quantization as imagesc()

% add custom colored border/padding
outpict = addborder(outpict,padw,padcolor);

% display it
image(outpict)