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

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Sachin Motwani
Sachin Motwani 2020-8-21
编辑： Sachin Motwani 2020-8-22
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?

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采纳的回答

Image Analyst
Image Analyst 2020-8-22
If you want to see the 3-D color gamut, you can use colorcloud
colorcloud(rgbImage);

更多回答（1 个）

Walter Roberson
Walter Roberson 2020-8-21
编辑：Walter Roberson 2020-8-22
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.

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