MATLAB: Help with image processing code

Question

Hi, i am new to matlab and need some help with this

i have used imread to read in a jpg image. however the workspace reads this as a 3 dimensional matrix, e.g. 150x100x3 uint8

how can i change this to a 2 dimensional matrix? i believe i have to use a gray scale image to accomplish this, but i cant seem to get it to work.

i have:

a = imread('image.jpg')
b = gray(a);

secondly, how can i read in a bunch of images into matlab for processing? i.e. i want to read in 1.jpg, 2.jpg, 3.jpg into the workspace. I know I need a for loop ,but i can't quite put the code together using the imread syntax.

for i = 1:5
a(i) = imread(xxxxx.jpg);
end

thank you

Answer 1

b = rgb2gray(a);

To read a bunch of images, please see this FAQ