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i have 20 images saved in a folder in computer now i have to convert to gray images at the time. how to convert rgb to gray ?

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rohit ranjan
rohit ranjan on 28 Oct 2015
Edited: Walter Roberson on 2 Nov 2015
i have 20 images saved in a folder in computer now i have to convert to gray images at the time. how to convert rgb to gray ?

Answers (1)

Wanbin Song
Wanbin Song on 28 Oct 2015
Supposed that your images are named as image1.png, image2.png, ... image20.png.
You can do it as follows:
for i = 1:20
img_str = sprintf('image%d.png', i);
temp_gray = rgb2gray(imread(img_str));
img_str = sprintf('gray_image%d.png', i);
imwrite(temp_gray, img_str);
end
Then, converted gray images will be stored in the path as name with 'gray_imgXX.png'.
  2 Comments
Wanbin Song
Wanbin Song on 2 Nov 2015
Is your code could read images correctly and displays it?
I don't think so, but if so, you just add the command 'rgb2gray'.

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