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 2015-10-28

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编辑： Walter Roberson 2015-11-2

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Answer 1

Wanbin Song 2015-10-28

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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'.

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rohit ranjan 2015-10-28

编辑：Walter Roberson 2015-11-2

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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