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changing the histogram color

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evangeline
evangeline 2014-1-22
评论： evangeline 2014-1-22
Is there any way to change the color of a histogram?

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Image Analyst
Image Analyst 2014-1-22
If you want each bar in a different color, then try the attached demo (below in blue text).

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Bjorn Gustavsson
Bjorn Gustavsson 2014-1-22
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
Image Analyst 2014-1-22
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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