Programmatically create histograms like Color Thresholder

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Jason Butler
Jason Butler 2022-11-16
编辑： DGM 2025-5-10
How can I programaticlly in Matlab code create image histograms that look like the ones in Color Thresholder? I don't want to launch Color Thresholder from the Matlab prompt. I want to generate my own histograms that looks like the ones in Color Thresholder. Ideally I would like to create this identical histogram in a script without having to manually open Color Thresholder, load my image, and then switch to YCbCr.

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Image Analyst
Image Analyst 2022-11-16
See attached demo. Adapt as needed. You can use bar() instead of plot() to make histograms like those.
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Jiang Karen
Jiang Karen 2025-5-9
How can I get that gradient fill? I hope you can answer. Thank you.
Image Analyst
Image Analyst 2025-5-9
I don't know off the top of my head if that is possible. I'd have to research it, which you can do just as well as me.

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DGM
DGM 2025-5-10
编辑：DGM 2025-5-10
In this answer I give a couple ways to create colorcoded histograms for multichannel images the long way. In the comments, I describe a third party tool that will simplify the task of figure setup and colormap generation for most colorspaces you might be trying to use.
https://www.mathworks.com/matlabcentral/answers/1936059-how-can-i-plot-the-ycbcr-histograms-with-the-correct-colour-points-0-255#answer_1202099
One of the comments also covers the difference between the way I generated axis-aligned colormaps for YCbCr, compared to the way that the Color Threshold app represents them. So if you really want to replicate that specific set of fill colors, you can.

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