How do I check if an image is RGB color or gray scale before execution?

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Priyanka Roy 2015-9-1

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/238663-how-do-i-check-if-an-image-is-rgb-color-or-gray-scale-before-execution

评论： Image Analyst 2021-6-30

采纳的回答： Image Analyst

How do I check if an image is RGB (true color) or gray scale before execution of my code?

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Priyanka Roy 2015-9-1

"If" condition satisfy for RGB image

if size(Image,3)==3

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Answer 1

Image Analyst 2015-9-1

7
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https://ww2.mathworks.cn/matlabcentral/answers/238663-how-do-i-check-if-an-image-is-rgb-color-or-gray-scale-before-execution#answer_190957

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See this snippet where I check if the number of color channels is 1 and then, if it's not, and I wanted a grayscale image instead of an RGB image, I convert it to gray scale:

grayImage = imread(fullFileName);
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Convert it to gray scale by taking only the green channel.
  grayImage = grayImage(:, :, 2); % Take green channel.
end

Of course you can call the image array anything you want, and check if numberOfColorChannels > 1 or if numberOfColorChannels == 3, or however you want to do it, and then take whatever actions you want to based on knowing how many color channels it has.