how to display image from array coloring specific values in white
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keisuke shimokawa
on 10 Nov 2017
Answered: Walter Roberson
on 10 Nov 2017
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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Accepted Answer
Walter Roberson
on 10 Nov 2017
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
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