How do I write a code to rearrage the colors in an RGB color array?

Question

Marisa Luallen 2021-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/765741-how-do-i-write-a-code-to-rearrage-the-colors-in-an-rgb-color-array

编辑： Jorg Woehl 2021-3-8

采纳的回答： Jorg Woehl

I have this image and I need to change the order of the colors. I have the image uploaded into MATLAB, with the code:

image1 = imread('colors.png')

The value is 229x600x3.

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Answer 1

Jorg Woehl 2021-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/765741-how-do-i-write-a-code-to-rearrage-the-colors-in-an-rgb-color-array#answer_641466

编辑：Jorg Woehl 2021-3-8

在 MATLAB Online 中打开

The third dimension of your 229x600 image contains the rgb values for each pixel: image1(:,:,1) is the red channel, image1(:,:,2) is the green channel, and image1(:,:3) is the blue channel.

To change the order of colors, it therefore is sufficient to copy the red -> green, green -> blue, and blue -> red channel. This can be done by a succession of matrix reassignment operations, or even simpler by using

image1 = circshift(image1,1,3)

This circularly shifts the third dimension of image1 by 1 position, cycling through the colors each time it is executed.