Why the image color bar doesn't contain certain color (Red, in particular)

I used the following code in order to explore RGB images

X = imread ('parrot.jpg');
image(X);
colorbar

The output

Why doesn't the color bar contain red color even when the image does?

Answer 1

[Image Analyst]

If you want to see the 3-D color gamut, you can use colorcloud

colorcloud(rgbImage);

[Sachin Motwani]

Thanks. This is what I wanted to see.

Answer 2

[Walter Roberson]

image() never changes the active colormap. (imshow() on the other hand changes the colormap for 2d arrays but not for rgb arrays.) You were displaying an rgb image so it had no need for a colormap.

colorbar never analyzes the contents of the display. colorbar only ever puts up a copy of the current colormap and associated numeric scale. In this case the default parula map was displayed.

See also https://www.mathworks.com/help/matlab/creating_plots/color-analysis-with-bivariate-histogram.html

Image Analyst has a better analysis tool but I cannot find it at the moment.

[KSSV]

@Walter Yes you are right..deleted my (wrong) answer.

[Sachin Motwani]

Thanks for the explaination of my mistake.