hue histogram color map

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RuiQi
RuiQi 2016-1-26
回答： Image Analyst 2016-1-27
Hi
I am trying to plot the hue histogram of my image. It currently looks like this.
I would like it to look like the one below.
Or at least just the bar below should be in color. I tried changing the colormap option but nothing changed. Help thanks !

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回答（2 个）

Walter Roberson
Walter Roberson 2016-1-26
[ind, map] = rgb2ind(YourRGBImage);
imhist(ind, map)
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RuiQi
RuiQi 2016-1-27
编辑：RuiQi 2016-1-27
Hi,
Thanks for the reply. Id like to plot a histogram of the hue channel of my image after it has been converted from RGB to HSV. In my first plot, the bar below is gray in color and I have no idea how to change its color to represent the hue like the 2nd image from wikipedia.
EDIT: My first plot is a plot of the hue of the image. I just need to change the bar from gray to color(hue).
Walter Roberson
Walter Roberson 2016-1-27
I don't think you can do it with imhist() then. You will probably need to bar() each different bar separately.

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Image Analyst
Image Analyst 2016-1-27
See attached demo where I change each bar individually. Feel free to adapt.

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