how to display image from array coloring specific values in white

Question

keisuke shimokawa 2017-11-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/366174-how-to-display-image-from-array-coloring-specific-values-in-white

回答： Walter Roberson 2017-11-10

采纳的回答： Walter Roberson

Hi,

I have a 501x501 matrix.

This matrix contains some values and zero values like below matrix.

a =

1 2 3 8 4

4 7 0 9 1

8 0 0 0 1

9 3 0 6 7

9 4 7 2 7

I want to display image from this kind of array coloring zero values in white because i cannot do this using image func image(a,'CDataMapping','scaled')

How can i do this?

thank,

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Answer 1

Walter Roberson 2017-11-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/366174-how-to-display-image-from-array-coloring-specific-values-in-white#answer_290302

在 MATLAB Online 中打开

color_in_white_here = double(a == 0);
white_color = ones(size(a,1), size(a,2), 3);
image(a, 'CDataMapping','scaled');
hold on
image(white_color, 'AlphaData', color_in_white_here);
hold off