Coloring a grayscale image to two colors

Question

Learner 2019-6-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468891-coloring-a-grayscale-image-to-two-colors

回答： Image Analyst 2019-6-26

I have a grayscale image as shown below, I would like to color the dark layer to blue color and the white layer to red color and if possible I would like to change the background to any other color. Can anyone help me with this?

Thanks in advance.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2019-6-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468891-coloring-a-grayscale-image-to-two-colors#answer_380798

在 MATLAB Online 中打开

Determine the threshold between light and dark and have the colormap have one color up to that threshold and then the other color after that threshold. like

threshold = 128
cmap = repmat([0, 0, 1], 256, 1); % Initialize to blue
% Make red from 128 & brighter
for row = threshold : size(cmap, 1)
	cmap(row, :) = [1,0,0];
end

Make the obvious adaptations for 3 or more color ranges.