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 ?

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 ?

Answer 1

[Wanbin Song]

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'.

[rohit ranjan]

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]

Is your code could read images correctly and displays it?

I don't think so, but if so, you just add the command 'rgb2gray'.