creating a color block inside a colormap? - homework

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Nora 2013-11-17

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评论： Nora 2013-11-18

For one part I need to create two 3 x 3 matrices and use subplot to display a colormap that shows a single color box/rectangle in the middle of the colormap. The two would have different colors.

For example, one would be completely blue except of a red square in the center of the color map. The second one could be light blue, with the red block in the center. ???

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Answer 1

Image Analyst 2013-11-18

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在 MATLAB Online 中打开

Try this:

matrix1 = [0,0,0;0,1,0;0,0,0]
matrix2 = [2,2,2;2,1,2;2,2,2]
subplot(1,2,1);
imshow(matrix1, [0,2], 'InitialMagnification', 1000);
myColorMap = [0,0,1;... % Blue
  1,0,0;...  % Red
  .5, .5, 1] % Light blue.
colorbar;
subplot(1,2,2);
imshow(matrix2, [0,2], 'InitialMagnification', 1000);
myColorMap = [0,0,1;... % Blue
  1,0,0;...  % Red
  .5, .5, 1] % Light blue.
colormap(myColorMap);
colorbar;

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Nora 2013-11-18

Yes that helped. Thank you!

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Answer 2

Walter Roberson 2013-11-17

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colormaps are N x 3 vectors, with N being the number of colors and 3 representing RGB. The only way they could be square would be if you only had 3 colors. A colormap does not have colors within it: it gives the information about what RGB corresponds to which color number.