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 2015-10-28
编辑： Walter Roberson 2015-11-2
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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回答（1 个）

Wanbin Song
Wanbin Song 2015-10-28
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 个评论
rohit ranjan
rohit ranjan 2015-10-28
编辑：Walter Roberson 2015-11-2
thank u sir for answer me
but my matlab code is
clear all;
close all;
clc;
path='E:\OLD_MYDOCUMENT\prabhu\matcodes\';
list=dir([path, '*.bmp']);
for x=1:length(list)
images{x}=imread([path, list(x).name]);
figure(x), imshow(images{x});
end
after this i have to convert gray image and show all the images. how to do?
Wanbin Song
Wanbin Song 2015-11-2
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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