Histogram Colors Not True

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J Shaw
J Shaw 2015-5-7
评论： Sara Cecilia Abecia Hernanz 2021-10-20
I have a histogram, and I am trying to change its color using:
set(get(gca,'child'),'FaceColor','k')
However, when I do this, the color comes out more of a gray than black. The same thing happens with red--it comes out more of a pink! Any ideas?

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Kelly Kearney
Kelly Kearney 2015-5-7
What is the FaceAlpha value of the child patch objects? It sounds as though it may be set to a value less than 1, which would lead to semi-transparent patches, hence the lighter look.
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Sara Cecilia Abecia Hernanz
Sara Cecilia Abecia Hernanz 2021-10-20
I might be a llitle too late but this is the only thread I see about the topic. I had the same problem and changing the 'FaceAlpha' value to 1 seems to have solved it, as @Kelly suggested (by default the value is set to 0.6).
Thank you!
Also the documentation on Histogram Properties might be checked here:
https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.histogram-properties.html

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Image Analyst
Image Analyst 2015-5-7
Plot it with bar and change the color there
bar(bins, counts, 'FaceColor', 'b', 'BarWidth', 1);

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