Lung CT image cannot convert to grayscale image and binary

i need your favour regards why my image cannot convert to grayscale? other image can process with the grayscale code. Attache is my picture

[muzaiyanah ahmad supian]

this image cannot process to grayscale n binary..

Answer 1

[KALYAN ACHARJYA]

im=imread('image.jpeg');
im_gray=rgb2gray(im);

The attached image is jpeg format, is it? May be the input image in dicom format, in such case use dicomread. If so, read using dicomread, then apply rgb2gray, or see the other option here (dicom to gray)

Good Luck!