Loaded Image Doesn't Retain Separate Colors

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Amanda 2012-8-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/47069-loaded-image-doesn-t-retain-separate-colors

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I have an image of a map loaded in MATLAB.

BEFORE the map is loaded into MATLAB the appearance is:

US Continent: Green

Ocean: Blue

Canada: Yellow

AFTER I load the map it is displaying:

Canada and the US as one color BUT I need to separate them by colors.

My code is:

im = double(imread('US.png'))
figure;
colormap summer;
...

Thanks,

Amanda

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采纳的回答

Walter Roberson 2012-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/47069-loaded-image-doesn-t-retain-separate-colors#answer_57537

在 MATLAB Online 中打开

Try

fig = figure;
ax = axes('Parent', fig);
[im, cmap] = imread('US.png');
if isempty(cmap)
  im = im2double(im);
  cmap = summer;
end
image(im, 'Parent', ax);
colormap(cmap);

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Amanda 2012-8-30

编辑：Amanda 2012-8-30

Walter -- I really appreciate it. Only a few people are plotting and imaging experts.

Image Analyst 2012-8-31

You're right, though it is the most used toolbox, according to the list at the left.

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MATLAB Graphics Images Modify Image Colors

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