How to limit the colorbar range in using image function ??

hello

I want to limit the colorbar range in using image function.

caxis([0 10]) comment can limit the range other function (i.e mesh), but can not work at image function.

how I limit the colorbar range??

thank you.

Answer 1

[Walter Roberson]

caxis works fine with image()

figure
img = imread('cameraman.tif');
image(img)
colormap(hsv)
caxis([0 10])
colorbar

But remember that colorbar() does not reflect RGB objects

figure
img = imread('flamingos.jpg');
image(img)
colormap(hsv)
caxis([0 10])
colorbar

[제 허]

thank you for your answer

but I cant limit the colorbar range.

I want to plot the 2D complex matrix signal rather than image file by using the image() function

thank you

[Walter Roberson]

I see what you mean; caxis() is not changing the colorbar() limit

Fortunately you can pass in the limits in the colorbar() call.

[R, TH] = ndgrid(complex(1:11, -5:5), linspace(0,2*pi));
[X, Y] = pol2cart(TH, R);
Z = X.^2 - 3.*X.*Y + Y;
figure
surf(real(X), real(Y), real(Z), 'edgecolor', 'none')

figure
surf(imag(X), imag(Y), imag(Z), 'edgecolor', 'none')

figure
RZ = real(Z);
image(RZ)
cb = colorbar('limits', [-50 50]);

cb

cb = 
  ColorBar with properties:

    Location: 'eastoutside'
      Limits: [-50 50]
    FontSize: 9
    Position: [0.8311 0.1109 0.0381 0.8152]
       Units: 'normalized'

  Show all properties

[제 허]

Thank you for your answer