imread and/or rgb2gray not working as expected

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Daniel Lee
Daniel Lee 2016-11-21
回答： KSSV 2016-11-21
I am trying to read an image and convert it to grayscale. Originally, I thought the problem was with the rgb2gray function, but when I displayed the image i was trying to read, it was completely different. Here is my code (I got a part of it from another forum) as well as the picture i was trying to read and convert to grayscale.
RGB = imread('Cir1.png');
imshow(RGB);
[rows columns numberOfColorChannels] = size(RGB);
if numberOfColorChannels > 1
Igray = rgb2gray(RGB);
else
Igray = RGB; % It's already gray.
end
imshow(Igray);
The image i am trying to read is show below.
Thanks!

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采纳的回答

KSSV
KSSV 2016-11-21
[RGB, map, alpha] = imread('Cir1.png');
figure ; imshow(RGB,map);
[rows, columns, numberOfColorChannels] = size(RGB);
if numberOfColorChannels > 1
Igray = rgb2gray(RGB);
else
Igray = rgb2gray(map);
end
figure ;imshow(RGB,Igray);

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