How can I change the line color in the output of imhist?
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Suresh Kumar
am 15 Aug. 2017
Kommentiert: Image Analyst
am 17 Aug. 2017
imhist provides the output in blue lines;i want to change it into say either red or green
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Image Analyst
am 15 Aug. 2017
Bearbeitet: Image Analyst
am 15 Aug. 2017
For precise control, plot it yourself with bar() and then set the 'EdgeColor' and 'FaceColor' properties in the bar() function:
img = imread('moon.tif');
[counts, grayLevels] = imhist(img, 64);
bar(grayLevels, counts, 'EdgeColor', 'r', 'FaceColor', 'c', 'BarWidth', 0.95);
Makes cyan bars with red outlines.
6 Kommentare
Image Analyst
am 17 Aug. 2017
This worked for me:
img = imread('moon.tif');
imhist(img, 64);
myHist = findobj(gca, 'Type', 'Stem');
% Change the color to red
myHist.Color = [1 0 0]
but Suresh was wondering if it could all be done inside imhist() without a separate call to bar(), or to findobj() and myHist.Color.
Personally, I like the wider bars created by bar() rather than the single pixel wide lines by imhist's build in stem display.
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Baptiste Ottino
am 15 Aug. 2017
The histogram is a 'Stem' element. Use findobj to access its properties:
imhist(myImage);
myHist = findobj(gca, 'Type', 'Stem');
% Change the color to red
myHist.Color = [1 0 0]
If you use an older version of Matlab, you can replace the last line by:
% Change the color to red
set(myHist, 'Color', [1 0 0]);
Good luck!
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