Colormap Question for script requirements? - Homework

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Nora 2013-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/106540-colormap-question-for-script-requirements-homework

评论： Nora 2013-11-19

I am trying to make two colormaps. Both will be using white and black colors only. It is a 50 x 50 matrix image where each element is randomly either white or black. However, the second image has the colors reversed (so all white is black and vice versa). This is my script I have.

subplot(1,2,1);
cm = [0 0 0;1 1 1];                
colormap(cm);
mat = randi(2,50);
image(mat);  
title('Yin');
subplot(1,2,2);
cm2 = [1 1 1;0 0 0];                
colormap(cm2);
image(mat);
title('Yang');

The only problem is that I don't know where to have the second image switch colors from the first image???

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Answer 1

Image Analyst 2013-11-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106540-colormap-question-for-script-requirements-homework#answer_115553

在 MATLAB Online 中打开

Try this:

subplot(1,2,1);
matrix1 = uint8(randi(2,50) - 1);
imshow(matrix1, []);  
title('Yin', 'FontSize', 50);
subplot(1,2,2);
matrix2 = 1 - matrix1;
imshow(matrix2, []);
title('Yang', 'FontSize', 50);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);

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Nora 2013-11-19

That works! Just curious though, how would I keep the x and y axis numbers/scale?

Nora 2013-11-19

在 MATLAB Online 中打开

What I mean is, is there a way to do the above using colormap?

I have this script but the second image isn't working.

subplot(1,2,1);
cm = [1 1 1; 0 0 0];                
colormap(cm);
mat = randi(2,50);
image(mat);  
title('Yin');
subplot(1,2,2);
cm2 = [1 1 1; 0 0 0];                
colormap(cm2);
mat2 = mat - 1;
image(mat2);
title('Yang');