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

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Priyanka Roy
Priyanka Roy 2015-9-1
评论： Image Analyst 2021-6-30
How do I check if an image is RGB (true color) or gray scale before execution of my code?

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Image Analyst
Image Analyst 2015-9-1
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.

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