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changing the histogram color
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evangeline
le 22 Jan 2014
Commenté : evangeline
le 22 Jan 2014
Is there any way to change the color of a histogram?
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Image Analyst
le 22 Jan 2014
If you want each bar in a different color, then try the attached demo (below in blue text).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/174254/image.jpeg)
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Bjorn Gustavsson
le 22 Jan 2014
Yes.
help hist
There you'll see that hist with no output parameters plot the histogram with BAR, and that you can get the count and bin position out of hist: [N,X] = hist(...
help bar
There you'll find more information about how to control and set the parameters of a bar plot.
So after reading that, and messing about with get(Bh) you'll end up with this:
[N,X] = hist(...
Bh = bar(X,N,'facecolor',[0.3 0.7 0.2]);
HTH
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Image Analyst
le 22 Jan 2014
That's why I prefer explicit, descriptive variable names. N is the pixel counts, and X is the gray level. You might write this as
axes(handles.axesImage); % Use the image axes to show the image.
imshow(grayImage);
axes(handles.axesPlot); % Use the plot axes for the plot.
[pixelCounts, grayLevels] = imhist(grayImage, 256);
bar(grayLevels, pixelCounts, 'FaceColor', [0.3 0.7 0.2]);
This will give 256 bars with each bar the color [0.3 0.7 0.2] which is greenish.
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